Keloids: Causes, Symptoms, Treatment & Prevention | NurseOnShift
🩹 Dermatological · Scarring

Keloids: Causes, Symptoms, Treatment & Prevention

Practice-focused reference for dermatology, plastic-surgery, primary-care and ward nurses—separate keloid from hypertrophic scar at the wound margin, deliver intralesional triamcinolone series safely, layer silicone, pressure and adjuvant therapy after excision, and counsel skin-of-color patients on realistic recurrence risk after piercings, acne and surgery.

⏱️22 min read
📅Updated May 5, 2026
Medically Reviewed
🔑Key Takeaways
  • Wound-margin extension is the single best discriminator. A scar that grows beyond the original injury is a keloid; one that respects the wound border and tends to flatten by 12–24 months is hypertrophic.
  • Intralesional triamcinolone anchors first-line therapy. Series of triamcinolone 10–40 mg/mL every 4–6 weeks shrinks 50–80% of keloids; symptoms (itch, burning, pain) usually settle before the scar visibly flattens.
  • Surgery alone is not management. Lone excision recurs in 45–100% of cases; modern practice pairs excision with intralesional steroid, silicone, pressure or post-operative superficial radiation.
  • Silicone gel sheeting works as both prevention and treatment—12–24 hours of daily contact for at least 2–3 months on intact, healed skin, with pressure on tension-prone sites such as ear cartilage, sternum and shoulder.
  • Skin-of-color counselling is non-negotiable. Avoid elective piercings (especially ear cartilage), be cautious with intralesional dosing to limit hypopigmentation and atrophy, and follow patients up at 3, 6 and 12 months because most recurrences appear inside the first year.

Quick Facts

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Skin-of-color prevalence
~4.5–16%
Peak onset age
10–30 years
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Most affected sites
Earlobe, chest, shoulder
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Collagen synthesis
~20× normal skin
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First-line therapy
Triamcinolone 10–40 mg/mL
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Recurrence after excision
45–100% if unaided

💡 Clinical Pearl

“Recurrent acne nodules” on a young Black or Asian patient’s chest, shoulders or jawline are often early keloids, not infection. Repeated antibiotic courses do nothing; the lever is early acne control, intralesional steroid at the first sign of a firm scar, and a low threshold for silicone or pressure therapy. Re-piercing the same earlobe after a keloid has been removed almost guarantees recurrence and is a frank conversation to have before excision is booked.

What is a keloid?

A keloid is a benign, fibroproliferative scar that arises after a wound-healing response runs unchecked in the reticular dermis. Where ordinary wound healing transitions through inflammation, fibroblast proliferation and maturation phases, the keloid pathway stalls in an aberrant fibroblastic phase: dermal fibroblasts proliferate excessively, resist apoptosis, and deposit thickened bundles of disorganised collagen at roughly twenty times the rate of normal skin and three times the rate of a hypertrophic scar. The result is a firm, rubbery dermal nodule that projects above the original wound and—definitionally—extends beyond its margin into surrounding healthy skin.

The biology behind that picture is increasingly understood as a localised, chronic inflammatory disorder of the reticular dermis rather than a simple over-healed scar. Transforming growth factor-β (TGF-β1 and TGF-β2 in particular), platelet-derived growth factor, connective tissue growth factor and interleukin-6 dominate the keloid-forming microenvironment; vascular abnormalities, mast-cell hyper-reactivity and prolonged tension on the wound bed reinforce the loop. Genetic susceptibility is real—familial clustering is common, several HLA associations have been described, and rare syndromes (Rubinstein–Taybi, Goeminne) confer markedly increased risk—but no single causative gene has been identified.

Clinically, keloids matter because they cause real morbidity even though they never metastasise: pruritus, burning, tenderness and pain are reported by most patients, and large lesions can restrict joint movement, distort cosmetically prominent sites (earlobes, chest, mandible) and carry a measurable psychological burden. They also matter because every clinician who handles a needle, a scalpel, a laser or a piercing gun in keloid-prone skin needs to know how to minimise the risk before it crystallises—prevention is far more effective than any current treatment.

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Keloid vs hypertrophic scar at a glance

Both are aberrant dermal scars; both follow trauma; both are commoner in patients with darker skin tones. The two diverge in behaviour, prognosis and management. The single most useful distinguishing question at the bedside is whether the scar respects the original wound margin.

FeatureKeloidHypertrophic scar
Wound-margin behaviourExtends beyond the original wound; advances claw-like into healthy skinConfined to the original wound; never crosses the original margin
Time courseDevelops 1–12 months (sometimes longer) after trauma; rarely regresses spontaneouslyDevelops within 4–8 weeks; usually flattens over 12–24 months
Height & shapeOften >4 mm, can be pedunculated or plaque-likeTypically <4 mm; follows the line of the wound
DistributionEarlobes, anterior chest, shoulders, deltoid, chin, upper backAny site; more common over flexor surfaces and burn-graft donor sites
Patient profileSkin of color, ages 10–30, family history commonAll skin types, all ages, often after burns or wounds under tension
HistologyHyalinised “keloidal collagen,” horizontal upper-reticular fibrous band, prominent deep fascial band, few vertical vesselsIncreased fibroblasts; collagen bundles parallel to the surface; vertically oriented vessels; α-SMA-rich myofibroblasts
Spontaneous regressionRareCommon with time and pressure therapy
Recurrence after excision45–100% if surgery is unaidedLower; well-managed with pressure and silicone

On a small screen, swipe or scroll sideways to see the full table.

Keloids do not have a single internationally agreed grading system, but practical bedside descriptors used in trials and clinical practice include lesion height, surface area, the number of separate lesions, symptom score (pain and itch on a 0–10 scale) and the Patient and Observer Scar Assessment Scale (POSAS). Documenting these consistently makes it possible to demonstrate response—or its absence—objectively.

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Clinical features

Patients usually present some weeks to many months after a triggering injury, although a small proportion describe spontaneous lesions where the inciting event was simply too trivial to recall. The lesion is firm, rubbery and frequently tender; the colour ranges from erythematous through dusky purple to flesh-coloured to hyperpigmented depending on Fitzpatrick type and lesion age.

Common presentations

  • Smooth, shiny, raised scar that crosses the line of the original wound or piercing track.
  • Persistent itching, burning or stinging—reported by approximately 86% of patients in case-series.
  • Pain or tenderness on palpation in roughly 46%—often worse at night or under tight clothing.
  • Pedunculated earlobe nodule after piercing, classically on the helix or lobe in adolescents.
  • Linear keloid along a sternotomy or caesarean scar, especially under tension.
  • “Acne keloidalis nuchae” pattern: firm papules and plaques along the occipital hairline in young Black men.
  • Post-inflammatory hyperpigmentation haloing the lesion in skin of color.

Pattern-recognition clues

  • Helix or earlobe nodule after a 6–12 week-old piercing—almost always keloid in keloid-prone skin; small lesions respond best to early intralesional steroid.
  • Sternal “rope” scar after CABG or cardiac surgery—high tension and skin of color combine; layered silicone and pressure prophylaxis are worthwhile from week 2 of healing.
  • Painful nodules along the upper back and shoulders in a patient with a history of severe nodulocystic acne—post-acne keloids are often misread as residual acne and over-treated with antibiotics.
  • Restricted joint movement from a large pre-sternal, scapular or shoulder keloid—document range of motion at every visit.
  • Dyspareunia or perineal discomfort after caesarean section, episiotomy or perineal surgery—uncommon but distressing keloid sites.

Atypical and easy-to-miss patterns

Spontaneous keloids—lesions appearing without recalled trauma—are well described, particularly on the pre-sternal chest. They are easily mistaken for fibrous papules, dermatofibromas or nodular acne. Conversely, a “keloid” that ulcerates, develops a heaped indurated edge, or grows rapidly without preceding trauma should prompt a biopsy to exclude dermatofibrosarcoma protuberans, lobomycosis (where geography fits), keloidal scleroderma, morphoea, or rarely cutaneous lymphoma. In children and adolescents, occipital keloids after head-louse treatment or vaccination scars are easily overlooked beneath the hairline; pull the hair forward and inspect the nape of the neck.

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Triggers & risk profile

Two factors must usually align for a keloid to form: a susceptible host and a trigger that disturbs the dermis. Either alone is rarely enough.

Host (patient) factors

  • Heritage: markedly higher prevalence in patients of African, Black Caribbean, Asian and Hispanic descent (4.5–16% in case-series), low in non-Hispanic White and very low in albino populations.
  • Age: peak incidence between ages 10 and 30; uncommon at extremes of age.
  • Family history: first-degree relatives with keloids confer significant risk; familial clustering is well described.
  • Hormonal milieu: incidence rises during puberty and pregnancy, suggesting endocrine modulation of dermal fibroblasts.
  • Rare syndromes: Rubinstein–Taybi, Goeminne, Bethlem myopathy and certain HLA-DR / HLA-DQ associations carry increased risk.
  • Comorbid skin disease: nodulocystic acne, recurrent folliculitis, ingrown hairs along the beard line, hidradenitis suppurativa and chronic eczema with repeated excoriation.

Triggers (the dermal insult)

  • Surgical wounds under tension—sternotomy, caesarean section, shoulder and scapular surgery, mastoid and earlobe procedures.
  • Piercings, especially helical/cartilage and earlobe piercings; nipple, navel and lip piercings next.
  • Tattoos, particularly large outlines and dark inks; symptomatic keloids may emerge months to years later.
  • Acne and folliculitis on the upper trunk, deltoid, shoulders and beard area.
  • Burns, abrasions and lacerations, especially when healing is delayed by infection or tension.
  • Vaccination scars (BCG in particular) and bite wounds.
  • Chickenpox and shingles craters, healed cutaneous infections, and impetigo-affected skin.
  • Mechanical tension across the wound—shared by all of the above; tension-relieving sutures, taping and silicone reduce risk.

Modifiable risk levers

The first three levers a clinician genuinely controls are wound tension, choice of elective procedure and prompt management of the early scar. Tension-relieving closure (subcuticular plus deep dermal sutures, paper tape or silicone strips for 2–3 months), avoidance of elective piercings on the helix and elective surgery on tension-prone sites in known keloid-formers, and early use of silicone gel sheeting once the wound is fully epithelialised together account for most of the practically achievable risk reduction.

🚨Do not miss
  • Dermatofibrosarcoma protuberans (DFSP). A “keloid” that arises without trauma, grows steadily, develops irregular borders or recurs aggressively after excision deserves dermatopathology review and—if confirmed—wide excision (often Mohs micrographic surgery) by plastic surgery.
  • Carcinoma in a chronic wound (Marjolin ulcer). Long-standing burn or chronic wound scars that ulcerate, develop heaped edges or bleed should be biopsied to exclude squamous cell carcinoma; do not assume malignancy is excluded by a keloid history.
  • Superinfection of an injected or excised keloid. Increasing pain, foul discharge, surrounding spreading erythema, fever or systemic upset—stop the injection schedule, send a wound culture, and treat per local cellulitis protocol while reviewing imaging if deep collection is suspected.
  • Steroid-injection emergencies. Anaphylaxis to triamcinolone is rare but described; vasovagal syncope is common at first treatment in adolescents; intra-arterial injection over the temple, glabella or alar rim risks tissue ischaemia—position carefully and aspirate before injecting.
  • Radiation-related malignancy follow-up. Long-term surveillance is appropriate after adjuvant radiotherapy near the breast, thyroid or salivary glands; rare reports of radiation-induced cancers exist and warrant honest counselling.
  • Psychiatric distress. Disfiguring keloids—especially facial and chest lesions in adolescents—are linked to depression, social withdrawal and self-harm; ask about mood and screen for safety actively.

Ward actions: Photograph at baseline with consent, document lesion dimensions and symptoms, hold steroid injections in actively infected skin, escalate atypical or rapidly growing lesions to dermatology or plastic surgery within the same week, and refer for psychological support when distress is significant.

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Diagnostic workup

Diagnosis is overwhelmingly clinical. The workup focuses on confirming the lesion is a keloid, ruling out the small but important list of mimics, and stratifying the patient for treatment intensity.

Bedside history checklist

  • Timeline: triggering trauma (surgery, piercing, acne, burn, vaccination), onset of the scar, growth pattern.
  • Personal and family history of keloids; previous treatments and outcomes; prior steroid response.
  • Comorbid acne, folliculitis or hidradenitis; smoking, diabetes, immunosuppression and current medications.
  • Symptom inventory: itch, burning, pain, dyspareunia, restricted joint movement, sleep impact.
  • Cosmetic and psychosocial impact; goal of treatment (symptom relief vs cosmetic flattening vs both).
  • Pregnancy or breastfeeding status (modifies steroid and 5-fluorouracil decisions).

Clinical examination

Inspect with good light and use a structured skin assessment covering the whole body, not just the presenting site—patients often have additional lesions they have stopped mentioning. Pair it with a head-to-toe assessment to look for scleroderma features, the “dimple sign” of dermatofibroma, lipodystrophy, lymphadenopathy and joint range-of-motion limitation overlying scarring.

  • Measure each lesion (length × width × height in millimetres) and photograph at baseline with consent.
  • Document Fitzpatrick skin type, distribution, colour, induration, tenderness and any ulceration.
  • Score symptoms on a 0–10 scale (pain, itch separately) at every visit.
  • Examine drainage to a cervical or axillary nodal basin if any concern about a malignant mimic.

When to investigate further

Most keloids need no investigations beyond a careful examination. A skin biopsy is reserved for atypical lesions: rapid growth without preceding trauma, ulceration or bleeding, irregular borders, lesions failing to respond as expected to standard therapy, or any clinical suspicion of dermatofibrosarcoma protuberans, scleroderma, lobomycosis or carcinoma. Histopathology in a true keloid shows broad bands of hyalinised eosinophilic “keloidal” collagen, a tongue-like advancing edge below the papillary dermis, a horizontal fibrous band in the upper reticular dermis, and a prominent deep fascial-like band; vertically oriented vessels are characteristically scarce.

A complete blood count and inflammatory markers are useful only if superinfection is suspected, while a wound swab and culture is appropriate for any draining or ulcerated lesion. Imaging (high-frequency ultrasound or MRI) is not routine but can occasionally help map deep extent before excision of a large pre-sternal lesion.

Common interpretation traps

  • “Hypertrophic scar” that is steadily growing months later. If extension beyond the wound margin is present, it is a keloid; treat accordingly.
  • Earlobe nodule “granuloma” after metal piercing. A true allergic granuloma is doughy and resolves on jewellery change; a hard, tender mass after 6–12 weeks is almost always a keloid.
  • “Failed acne” on the chest and shoulders. Persistent firm nodules along acne scars are usually keloids—antibiotics will not help.
  • Steroid “failure” after one injection. Most keloids need 3–6 sessions at 4–6 week intervals; do not abandon the protocol prematurely.
  • Cryotherapy first in dark skin. Risks long-lasting hypopigmentation; combine with steroid or use other modalities first in Fitzpatrick IV–VI.
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Clinical decision flow

A pragmatic chain that ward, primary-care and outpatient teams can apply on first contact:

  1. Confirm the diagnosis at the wound margin. Extension beyond the original injury and a typical site or risk profile makes a keloid the working diagnosis; biopsy only when atypical features are present.
  2. Stage the lesion and the patient. Size, height, symptoms, location, joint involvement, Fitzpatrick type, family history and previous treatments determine the intensity of the plan.
  3. Set realistic goals together. Symptom relief, cosmetic flattening, regaining the ability to wear earrings, restoring joint movement—each goal demands different combinations of therapy.
  4. Start the universal foundation. Daily silicone gel sheeting over the lesion (once skin is intact), pressure where feasible (earring, garment), trigger removal (avoid further piercings, manage acne), and wound-tension reduction at any new healing site.
  5. Layer first-line therapy. Intralesional triamcinolone 10–40 mg/mL every 4–6 weeks for 3–6 sessions for symptomatic, small to moderate lesions; pressure and silicone in parallel.
  6. Escalate when needed. Refractory or large lesions: combine triamcinolone with 5-fluorouracil, add cryotherapy or laser, consider intralesional verapamil or bleomycin in specialist hands.
  7. Consider excision only with adjuvant therapy. Reserve for large pedunculated lesions, functional impairment or failed conservative therapy; pair with intralesional steroid (within 2–3 weeks post-op, then every 4–6 weeks for 6 months), silicone, pressure, and—if appropriate—superficial radiation therapy within 24–48 hours.
  8. Plan structured follow-up. Review at 4–6 weeks after the last injection, then at 3, 6 and 12 months; most recurrences appear in the first year. Re-treat early at the first sign of regrowth.
  9. Refer urgently for atypical lesions, suspected DFSP or carcinoma, refractory symptoms, paediatric facial keloids, large radiation-candidate lesions or significant psychological distress.
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Differential diagnosis

MimicHow it differs
Hypertrophic scarStays within the original wound, flattens within 12–24 months, fewer hyalinised collagen bundles, vertical vessels visible on histology.
DermatofibromaFirm pigmented papule, classic central depression with lateral pressure (“dimple sign”); typically post-insect-bite, not site-specific.
Dermatofibrosarcoma protuberans (DFSP)Spindle-cell tumour of trunk and proximal limbs in young adults; arises without trauma, grows steadily, irregular border—biopsy if uncertain.
Keloidal morphoea / sclerodermaProgressive nodular plaques without an inciting injury; may have other connective-tissue features (Raynaud, sclerodactyly, ANA positivity).
Lobomycosis (Lacazia loboi)Slow-growing keloid-like nodules on cool body sites in patients with Central/South American or dolphin exposure; KOH and culture confirm.
Cutaneous lymphomaPersistent erythematous plaques or nodules; biopsy with immunohistochemistry differentiates.
Foreign-body granulomaSoft, fluctuant nodule around suture, hair fragment or piercing residue; resolves with foreign-body removal.
Acne keloidalis nuchaeSpecific keloid variant on the occipital scalp/neck; managed with potent topical steroids, intralesional steroid, antibiotics for inflammatory phase and laser hair reduction.
Sebaceous cyst with scarPunctum visible, contents expressible; ultrasound clarifies if doubt.

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Treatment ladder

No single therapy reliably eradicates a keloid. The clinical reality is that combination treatment, layered over months, delivers the best symptom relief and the lowest recurrence rates. The ladder runs three rails simultaneously: prevent further injury to the lesion or any new wound, repair and protect the dermis with silicone and pressure, and modulate the abnormal fibroblast response with intralesional and adjuvant agents.

Universal foundation (every patient)

  • Silicone gel sheeting or topical silicone gel for at least 12–24 hours per day for ≥2–3 months on intact, healed skin. Suitable for both established keloids and prevention after high-risk wounds.
  • Pressure therapy at 15–45 mmHg for >23 hours per day for at least 6 months on amenable sites: pressure earrings for earlobe lesions, custom garments for chest, shoulder and limb lesions.
  • Trigger control: avoid further piercings (especially helical), treat acne early and aggressively, manage folliculitis and ingrown hairs, and reduce wound tension with subcuticular closure and paper-tape stabilisation in any new wound.
  • Symptom relief: bland emollients, soap substitutes and (rarely) short courses of second-generation antihistamines such as cetirizine, loratadine or fexofenadine for prominent itch.
  • Patient and family education about realistic expectations, lifelong susceptibility and the value of early re-treatment.

First-line systemic dermal therapy

  • Intralesional triamcinolone acetonide: 10 mg/mL for small or facial lesions, 20–40 mg/mL for thicker body lesions, every 4–6 weeks for 3–6 sessions; expect symptom relief by injection 2 and visible flattening by injection 3–4.
  • Topical mid-to-high potency corticosteroids (mometasone, betamethasone valerate or clobetasol for short pulses) under occlusion can ease itch and inflammation between injections; hydrocortisone 1% is suitable for face, eyelids and intertriginous sites.
  • Steroid-impregnated tape (e.g. flurandrenolide tape) is useful as a continuous low-dose alternative on small lesions.

Second-line and combination intralesional therapy

AgentTypical regimenBest used when…
5-Fluorouracil (5-FU) ± triamcinolone5-FU 50 mg/mL, often blended 0.1–0.2 mL with triamcinolone 40 mg/mL, every 1–4 weeksSteroid-resistant lesions; mitigates steroid atrophy and hypopigmentation
Cryotherapy (contact, spray or intralesional cryoneedle)10–20 second freeze-thaw cycles, 3–4 sessions at 3–4 week intervalsSmall earlobe and chest lesions in lighter skin types; pre-injection softening
Pulsed-dye laser (585 / 595 nm)3–6 sessions at 4–8 week intervalsErythematous, hypervascular keloids; combined with intralesional steroid
Nd:YAG laser (1064 nm)Multiple sessions; safer in deeper Fitzpatrick typesSkin of color; complements pulsed-dye approach
Intralesional bleomycin0.1–1 IU per session, multipuncture or jet injector, every 2–6 weeksRefractory lesions in specialist clinics
Intralesional verapamil2.5 mg/mL every 2–4 weeksSteroid alternative when atrophy is a problem
Topical imiquimod 5%Five nights per week for 8 weeks after excisionPost-excision earlobe keloids; less evidence on trunk
Topical tacrolimus 0.1%Adjunct to silicone on small lesionsPruritus relief; limited evidence on flattening

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Surgical excision and adjuvant therapy

Surgery alone recurs in 45–100% of keloids, often regrowing larger and more symptomatic than the original lesion. Combine excision with one or more of:

  • Post-operative intralesional triamcinolone starting 2–3 weeks after suture removal, repeated every 4–6 weeks for 6 months; widely available and cost-effective.
  • Adjuvant superficial radiation therapy (SRT) delivered within 24–48 hours of excision (10–20 Gy in fractionated doses), which can reduce recurrence to ~10–20%; counsel about peeling, pigment change and rare radiation-induced malignancy, and avoid near breast, thyroid or salivary glands when alternatives exist.
  • Pressure earring or compression garment for 6–12 months post-excision.
  • Silicone gel sheeting from the moment the wound is fully epithelialised.
  • Suture choice and closure technique: tension-relieving deep dermal sutures, subcuticular monofilament closure, layered repair to minimise wound tension.

Refractory and special situations

ScenarioPreferred ladderNotes
Earlobe keloid, post-piercing, <1 cmTriamcinolone series ± cryotherapy → silicone + pressure earring → consider excision with post-op steroid if refractoryRe-piercing the same site after removal carries high recurrence; counsel before treatment
Pre-sternal or shoulder keloidTriamcinolone + 5-FU combination, daily silicone, pressure garment → SRT-augmented excision for large pedunculated lesionsHigh tension site; long-term silicone after any treatment
Acne keloidalis nuchaeTopical/intralesional steroid, doxycycline for inflammatory phase, laser hair reduction; surgical excision below hair-bearing area in advanced diseaseAddress ongoing folliculitis to prevent recurrence
Burn scar with keloid featuresPressure garments, silicone, intralesional steroid; methotrexate or cyclosporine in selected refractory cases under specialist careFunctional rehabilitation matters as much as cosmetic outcome
Paediatric facial keloidConservative — silicone, pressure if tolerated, lower-strength triamcinolone (5–10 mg/mL); avoid radiation under 18 yearsMultidisciplinary plastic-surgery and paediatric dermatology input
PregnancyDefer elective injections; silicone, pressure and topical low-potency steroid only; revisit after delivery and breastfeedingHormonal milieu may transiently worsen lesions

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Intralesional injection protocol

Intralesional steroid injection is the workhorse of keloid management. The technique is straightforward but unforgiving—getting it right protects the patient from atrophy, hypopigmentation and disappointing outcomes.

Pre-procedure (nursing role)

  • Confirm patient identity, lesion site, planned drug (triamcinolone acetonide), dilution and volume; check allergy status and pregnancy/breastfeeding status.
  • Exclude active infection over the lesion; defer if any cellulitis, weeping or drainage is present.
  • Review systemic conditions that complicate steroid use—uncontrolled diabetes, recent live vaccine, severe immunosuppression—and discuss with the clinician.
  • Photograph the lesion with consent, measure dimensions and record symptom scores (pain and itch on 0–10 scales).
  • Set out 27–30G needles with Luer-lock syringes (keloid tissue is dense and will leak under high back-pressure with slip-tip syringes), chlorhexidine or alcohol skin wipes, gauze and sharps disposal.
  • Position the patient comfortably—supine for chest, prone for upper back, head supported on a pillow for ear lesions; warn about transient burning during injection and offer topical lidocaine or a cold pack first.

During the procedure

  • Verify drug, dose and concentration with the prescribing clinician using a structured medication administration check.
  • Stabilise the skin around the keloid; the injection plane is intralesional (into the dense scar), not subcutaneous.
  • Aspirate before injecting in vascular sites (helix, glabella, alar rim, temple) to avoid intra-arterial steroid.
  • Inject slowly until visible blanching is achieved across the lesion; a typical small earlobe lesion takes 0.1–0.3 mL of 10–20 mg/mL triamcinolone, larger chest lesions 0.5–2 mL of 20–40 mg/mL.
  • Apply gentle pressure with gauze afterwards; document the volume injected, the concentration and the actual site.
  • Monitor for vasovagal pre-syncope, particularly in adolescents; lower the head, raise the legs and reassess vital signs as needed.

Post-procedure and follow-up

  • Counsel that mild burning and tenderness can persist for 24–48 hours; cool packs help.
  • Possible side effects: skin atrophy, telangiectasia, hypopigmentation in dark skin, menstrual irregularity (rare) and very rarely adrenal suppression with high cumulative doses (e.g. >40 mg/week long-term).
  • Schedule the next session in 4–6 weeks; advise the patient to contact the clinic if signs of infection, blistering or rapidly increasing pain develop in the interim.
  • Continue silicone and pressure between sessions; document symptom and size response at every visit.
  • Plan to step down to topical or longer-interval injections once symptoms resolve and the lesion plateaus.
⚠️Safety reminders
  • Never inject into actively infected or ulcerated lesions—bacterial seeding and necrosis can follow.
  • Cumulative steroid limits matter: aim to keep total triamcinolone below ~40 mg per session and below ~120 mg over 3 weeks, especially in children, pregnant patients or those on systemic steroids.
  • Skin atrophy can be permanent—dilute carefully and avoid repeat injections at the same crater within a single visit.
  • Have local anaphylaxis kit and adrenaline accessible; rare reactions to triamcinolone or its preservatives have been reported.
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Pregnancy, paediatric & skin of color

Pregnancy and lactation

Keloids commonly become more pruritic and may enlarge slightly during pregnancy under hormonal influence. Defer elective intralesional therapy until after delivery and the early breastfeeding phase if possible. Silicone gel sheeting, pressure garments and short-term low-potency topical steroids are generally considered safe in pregnancy. Avoid 5-fluorouracil, bleomycin and methotrexate. Re-stage and re-plan in the early postpartum period; lesions that grew in pregnancy may regress modestly but rarely return fully to their pre-pregnancy size without intervention.

Paediatric considerations

Children and adolescents present unique challenges: they are in the peak-incidence age window, lesion sites (face, ears, anterior chest) are cosmetically prominent, and procedural tolerance is variable. Use lower triamcinolone concentrations (5–10 mg/mL) at smaller volumes, prioritise non-pharmacological measures (silicone, pressure earrings) and involve play specialists where injections are needed. Avoid radiation in patients under 18 years where alternatives exist. Active acne control in adolescence is one of the highest-yield prevention measures available.

Skin of color (Fitzpatrick IV–VI)

Patients of African, Asian, Hispanic and Black Caribbean heritage shoulder the bulk of keloid prevalence and bear the greatest risk of adverse cosmetic effects from treatment. Practical adaptations include: starting at lower triamcinolone concentrations (10–20 mg/mL) and stepping up only as needed; using verapamil or 5-FU when steroid atrophy or hypopigmentation is becoming a problem; preferring Nd:YAG over pulsed-dye laser to limit pigment alteration; using cryotherapy cautiously and combining it with intralesional steroid to limit hypopigmentation; and counselling explicitly on lifelong susceptibility, with practical guidance on avoiding helical piercings, treating acne early and protecting any new wound with silicone and tension-relieving closure.

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Clinical practice considerations

  • Document objectively at every visit. Use length × width × height in millimetres, photographs (with consent), pain and itch on 0–10 scales, and POSAS scores where the unit uses them. Trends matter more than single snapshots.
  • Confirm the plan before each injection. Drug, concentration, total volume, allergy status, infection status, pregnancy status; a structured medication-administration check eliminates most preventable errors.
  • Choose the right injection equipment. 27–30G needles with Luer-lock syringes—dense scar tissue will pop slip-tip syringes apart. Pre-filled cartridges reduce dose-calculation errors when available.
  • Coach the silicone routine. Patients commonly under-use silicone (sub-therapeutic 4–6 hours/day). Teach a 12–24 hour daily target on intact, healed skin, with rotation breaks to prevent maceration; an explicit wound care teach with a written schedule improves adherence.
  • Reassess pressure devices. Pressure earrings stretch and lose force; garments lose elasticity after 2–3 months of laundering. Re-fit and replace as needed to maintain 15–45 mmHg.
  • Use a structured nursing handoff at each clinic transition: lesion size, current therapy step, last injection dose and date, planned next session, and any psychosocial flags.
  • Track pain assessment trends. A rising pain score between sessions can flag superinfection, rapid growth or psychosocial decompensation—not just “waiting for the next injection”.
  • Coordinate elective surgery proactively. Flag any keloid-prone patient on the pre-operative checklist; offer prophylactic silicone and pressure planning at discharge after sternotomy, caesarean section, mastoid or earlobe procedures.
  • Mind infection control for intralesional procedures—single-dose vials where possible, sterile technique, never re-cap needles, and document every sharps event.
  • Refer early when red flags appear. Atypical lesions, paediatric facial keloids, refractory symptoms, suspected DFSP and significant psychological distress all warrant same-week specialist contact.
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Bedside monitoring checklist

At every clinic visit

  • Lesion measurements (length × width × height) and high-quality photograph with consent and date stamp.
  • Pain and itch scores (0–10) compared with baseline and previous visit.
  • Functional impact: joint range of motion, ability to wear earrings, dyspareunia, cosmetic distress.
  • Adjuvant adherence: silicone hours/day, pressure garment hours/day, topical regimen.
  • Side effects of previous injections: skin thinning, hypopigmentation, telangiectasia, menstrual change.
  • Mood and psychosocial status; safety screening when distress is significant.

During an intralesional injection visit

  • Vital signs, particularly in adolescents and anxious patients—vasovagal episodes are common at first injection.
  • Pre-procedure timeout: drug, dilution, dose, site, allergy and infection check confirmed verbally.
  • Observe for blanching of the lesion as injection progresses; stop if blanching extends well beyond the keloid.
  • Post-injection: gauze pressure, observation for 5–10 minutes, written aftercare advice, scheduled review date.

Red flags requiring escalation

  • Spreading erythema, increasing pain, fever or purulent drainage from an injected or excised lesion—suspect superinfection and start the local cellulitis pathway.
  • Rapid lesion growth without preceding trauma, ulceration or bleeding—biopsy to exclude DFSP, carcinoma or aggressive variant.
  • New paraesthesia, weakness or restricted joint movement after injection—consider intra-tissue spread or injection-related complication.
  • Signs of systemic steroid effect (Cushingoid features, glucose dysregulation, menstrual irregularity, mood change) in patients receiving frequent or high-dose intralesional therapy.
  • Recurrence within 3 months of treatment completion—re-treat early; mature recurrences respond far less well.
  • Suicidal ideation, severe body-image distress or social withdrawal—refer for psychological support.
⚠️

Possible complications

Direct from the keloid

  • Persistent pruritus and pain—often the dominant patient-reported burden.
  • Restricted joint movement when the lesion overlies a joint or major muscle group.
  • Cosmetic disfigurement, particularly facial, anterior chest and earlobe lesions; significant psychological impact in adolescents and young adults.
  • Secondary bacterial infection of macerated, scratched or ulcerated lesions—staphylococcal cellulitis is the most common downstream event.
  • Sleep disturbance and daytime fatigue from pruritus or pressure-related discomfort.

From treatment

  • Intralesional steroid: skin atrophy, telangiectasia, hypopigmentation in skin of color, peri-lesional fat atrophy, very rare adrenal suppression with high cumulative dose, vasovagal syncope at injection.
  • Cryotherapy: pain, blistering, prolonged hypopigmentation (especially in Fitzpatrick IV–VI), delayed healing.
  • Surgical excision: 45–100% recurrence risk if unaided, often regrowing larger; new wound infection; widening of scar.
  • Radiation therapy: peeling, prolonged pigment change, telangiectasia, rare reports of radiation-induced malignancy in adjacent tissues over the long term.
  • 5-Fluorouracil and bleomycin: local hyperpigmentation, ulceration, transient leucopenia with high cumulative doses; bleomycin carries very rare pulmonary fibrosis risk at much higher systemic doses than used intralesionally.
  • Laser: pigmentary changes, blistering and rare scarring at higher fluences.
  • Topical agents (steroids, tacrolimus, imiquimod): local irritation, pigment change, infection risk if applied over broken skin.
🛡️

Prevention & risk reduction

Prevention has the largest practical impact for keloid-prone patients—every clinical interaction is a chance to reduce future lesion burden. The highest-yield levers are:

  • Avoid elective skin trauma in known keloid-formers. Counsel against helical and cartilage piercings, multiple ear piercings, decorative scarification, and elective tattoos in younger keloid-prone patients.
  • Treat acne early and effectively. Aggressive management of nodulocystic acne reduces post-acne keloid formation on the chest, shoulders and jawline.
  • Engineer surgical wounds for low tension. Place incisions along Langer lines where possible; use deep dermal and subcuticular sutures; tape or silicone strips for 8–12 weeks after suture removal in keloid-prone patients undergoing elective surgery.
  • Apply silicone gel sheeting prophylactically over high-risk healed wounds (sternotomy, caesarean section, shoulder and ear surgery) once full re-epithelialisation is confirmed—12–24 hours/day for 2–3 months.
  • Use pressure on amenable sites—pressure earrings after lobe surgery, custom garments after thoracic and limb surgery in burn-care pathways.
  • Treat early scar warning signs. A red, raised, itchy scar at week 4–8 is the optimum window for a single early intralesional injection or aggressive silicone/pressure use—small, immature lesions respond far better than mature keloids.
  • Counsel on re-piercing and re-tattooing. Re-injuring a previously keloid-affected site almost guarantees recurrence; honest conversation before any procedure prevents avoidable harm.
  • Manage comorbid skin disease—folliculitis, hidradenitis, ingrown hairs along the beard line and chronic eczema with excoriation all add cumulative dermal trauma.
📈

Prognosis & outlook

Prognosis is mixed and honest counselling is critical. Approximately 50–80% of keloids shrink with a series of intralesional triamcinolone injections, but many regrow within five years; combined excision plus adjuvant therapy (intralesional steroid, silicone, pressure or superficial radiation) reduces recurrence to roughly 10–30% in published series. Pure surgical excision recurs in 45–100% of cases and should be reserved for combination strategies. Most recurrences appear within the first year after treatment, with the majority before five years; lifelong susceptibility means new lesions can develop at fresh sites.

Symptom relief usually outpaces cosmetic flattening: pruritus and pain typically improve after the second or third injection, while visible reduction in height and surface area lags by several sessions. A patient who walks out of clinic itch-free but with a still-prominent scar is a treatment success in progress, not a failure. Maturation of any treated scar continues for 12–24 months, and ongoing silicone, pressure and trigger-avoidance support the long arc of remodelling. Set the expectation explicitly that keloid management is a maintenance endeavour rather than a one-shot cure.

👩‍⚕️

In Clinical Practice…

Subtle deterioration

The keloid that is quietly worsening rarely complains loudly. Watch for the cluster: a lesion that has crept beyond its previous photo border, a darker peripheral halo, a new pinpoint scab from scratching at night, a patient who has stopped coming back for sessions “because it didn’t help” when in fact symptoms had been improving. A scheduled phone or text follow-up between visits often catches drift before it becomes loss to follow-up.

Communication friction

Keloid patients—particularly skin-of-color patients—often arrive having been told for years that their scarring is “just scarring” or that nothing can be done. Acknowledge the impact, validate the previous experience, and outline a structured plan with realistic milestones. Be honest that complete eradication is rarely possible but that symptom control, slowing growth and modest cosmetic improvement are achievable in most patients with a layered approach. Avoid promising flat skin from a single injection.

Bedside checklist

  • Photograph and measure at every visit; trends decide whether the plan is working.
  • Confirm silicone hours/day and pressure garment use—numerically, not “yes I’m using it”.
  • Re-take the trigger history each visit (new piercings, new acne flare, new tattoos).
  • Reconcile medications—new ACE inhibitors, isotretinoin, immunomodulators or chemotherapeutics may modify scarring biology.
  • Schedule the next session and the next milestone review at clinic exit—open-ended waiting fuels disengagement.
  • Loop in psychological support early when distress is significant; the burden is real and often underestimated.
🚨

When to escalate urgently

🚨Activate urgent or emergency pathway
  • Spreading erythema, fever, lymphangitic streaks or hypotension after intralesional injection or excision—suspected staphylococcal or streptococcal infection; activate the local cellulitis or sepsis pathway.
  • Rapid lesion enlargement without preceding trauma, ulceration with heaped indurated edge or unexplained bleeding—same-week dermatology / plastic surgery referral with biopsy to exclude DFSP, carcinoma or aggressive mimic.
  • Anaphylaxis after triamcinolone or local anaesthetic—intramuscular adrenaline 0.5 mg (adult), oxygen, IV access and senior review per local allergy and resuscitation protocols.
  • Acute pain, pallor or coldness in a finger or facial area immediately after injection—possible intra-arterial steroid; warm compresses, urgent senior review and consider vasodilator therapy.
  • Suicidal ideation or severe body-image distress—same-day mental health team referral.
  • Loss of joint range of motion, vascular compromise or airway-related lesion expansion (e.g. anterior neck keloid)—same-week multidisciplinary review with plastic surgery, dermatology and (where airway is at risk) ENT.

Initial bundle: ABCDE primary survey if systemically unwell, IV access, vital signs and capillary glucose, paired bloods (FBC, CRP, U&E, glucose) plus blood cultures and a wound swab if infection suspected. Stop the injection schedule, photograph the lesion, document the timeline of symptoms, and escalate to dermatology, plastic surgery or critical care as the picture evolves. Never assume that a tender, erythematous keloid is simply “post-injection inflammation” without ruling out infection.

📚

NCLEX practice questions

These NCLEX-style clinical judgment practice items focus on the nursing priorities for this condition — recognise cues, escalate red flags, take safe action and evaluate outcomes (NCSBN Clinical Judgment Measurement Model) — through Priority FIRST, SATA, deterioration trends, multi-patient triage, ordered response, matrix matching and cloze completion on the topic of keloid recognition, intralesional steroid technique, post-excision adjuvant planning and red-flag escalation—matched to Clinical Judgment Measurement Model layering of cues before action.

Unfolding case (Questions 1–3): Ms. A., 17, of Black Caribbean heritage, attends the dermatology clinic 4 months after her second helical (cartilage) ear piercing. A 1.2 × 0.8 × 0.6 cm firm, pedunculated nodule has grown beyond the piercing track and is increasingly itchy and tender. She has a sister with similar lesions on her chest after caesarean section. Vitals: T 36.8 °C, HR 78, BP 118/72, RR 14, SpO₂ 99%. The lesion is non-fluctuant, with no surrounding warmth or drainage; pain score 4/10, itch 6/10.

Question 1 · Type 6 — Case study · Layer 5 (Take actions) · Type 1 — MCQ · Family A (Priority — FIRST)

After confirming the diagnosis is most consistent with a keloid, what should the nurse plan FIRST in coordination with the dermatologist?

Question 2 · Type 6 — Case study · Layer 2 (Analyze cues) · Type 2 — SATA · Family C (Select all that apply)

Which features make keloid more likely than hypertrophic scar in this patient? Select all that apply.

Question 3 · Type 6 — Case study · Layer 6 (Evaluate outcomes) · Type 2 — SATA · Family E (Deterioration cues)
Five days after her second triamcinolone injection, Ms. A. presents with a 6/10 throbbing pain at the injection site, surrounding erythema extending 3 cm beyond the lesion, low-grade fever 38.0 °C, and yellow purulent discharge. HR 102, BP 116/70, RR 18, SpO₂ 98%. The lesion itself is more swollen than at her last visit.

Which actions should the nurse take now? Select all that apply.

Question 4 · Type 1 — MCQ · Family F (Multi-patient triage)

Four patients arrive at a dermatology day-case unit. Whom should the nurse prioritise FIRST?

Question 5 · Type 4 — Ordered response · Family H (Ordered response)

A 40-year-old keloid-prone patient is scheduled for excision of a large pedunculated earlobe keloid. Sequence the correct nursing and clinical steps for combined surgical and adjuvant management (1 = first action).

Question 6 · Type 8 — Matrix · Family G (Matrix / matching)

For each scenario, select the most appropriate nursing pathway.

ScenarioReassurance & routine reviewPriority clinician review & targeted interventionEmergency / urgent escalation
25-year-old keloid-prone patient asking about prevention before a planned caesarean section
19-year-old with a 6-week-old earlobe keloid, no infection, increasing itch and redness
45-year-old with rapidly enlarging, ulcerating chest nodule that arose without trauma over 8 weeks
28-year-old, 4 days after her third triamcinolone injection, with throbbing pain, fever 38.5 °C and pus from the lesion

On a small screen, swipe or scroll sideways to see the full table.

Answer key & rationale

How do I tell a keloid from a hypertrophic scar at the bedside?

The single most useful sign is wound-margin behaviour: a hypertrophic scar stays inside the line of the original wound and tends to flatten over 12–24 months, while a keloid grows beyond the wound margin, often advances into surrounding skin, and rarely regresses on its own. Hypertrophic scars usually project less than 4 mm above the skin and follow tension lines; keloids may be pedunculated or plaque-like, are commoner on the earlobes, anterior chest, shoulders, deltoid and chin, and are far more likely in skin-of-color patients with a positive family history. Document size, height and extension at every visit so progression can be tracked objectively.

What is the first-line treatment a nurse should expect for a small earlobe keloid?

For most small to moderate keloids, first-line therapy is a series of intralesional triamcinolone acetonide injections — typically 10–40 mg/mL diluted to the lesion’s response, given every 4–6 weeks for 3–6 cycles. Symptoms (itch, burning, tenderness) usually settle by the second injection; visible flattening lags by several sessions. Pair it with daily silicone gel sheeting (12–24 hours/day for at least 2–3 months) and, on the earlobe, a pressure earring at 15–45 mmHg for the same period. Counsel patients that 50–80% of keloids shrink with steroid series and that recurrence within 5 years is common — combination therapy is the realistic standard.

Why is surgery alone discouraged for keloids?

Lone surgical excision carries a 45–100% recurrence rate, and recurrent keloids are often larger and more symptomatic than the original lesion. Modern practice combines excision with adjuvant therapy — most commonly post-operative intralesional triamcinolone (starting within 2–3 weeks and repeated every 4–6 weeks for 6 months), silicone gel sheeting and pressure therapy, or superficial radiation therapy delivered within 24–48 hours of surgery. With layered adjuvant therapy, recurrence falls to roughly 10–30%. Surgery is therefore reserved for selected patients (large pedunculated lesions, functional impairment, failed conservative therapy) within a multimodal plan.

Are keloids ever malignant?

Keloids themselves are benign growths of dermal collagen — they do not metastasise and they do not transform into skin cancer at meaningful rates. The differential matters: dermatofibrosarcoma protuberans, keloidal scleroderma or morphoea, lobomycosis (in patients with relevant geographic exposure) and rarely cutaneous lymphoma can mimic a keloid. Biopsy is reserved for atypical lesions, lesions arising without preceding trauma, rapidly growing or ulcerating lesions, or where treatment is failing in an unexpected pattern. Long-term follow-up is also warranted for keloids treated with radiation, given rare reports of radiation-induced malignancy in adjacent tissues.

How should I prepare and assist with an intralesional triamcinolone injection?

Confirm the site, the diluted dose (commonly 10, 20 or 40 mg/mL of triamcinolone acetonide), allergy status and the absence of active infection over the lesion. Set out a small-bore (27–30G) needle and Luer-lock syringe — keloid tissue is dense and offers high back-pressure. Position the patient comfortably, clean the lesion with chlorhexidine or alcohol, and steady the skin around the keloid. Anticipate transient blanching, mild burning during injection, and occasional bleeding. Document the volume injected, the concentration, the lesion dimensions before and after, and the pain score. Counsel the patient on possible side effects (skin atrophy, hypopigmentation in dark skin, telangiectasia, menstrual irregularity, very rare adrenal suppression with high cumulative dose) and on the typical 4–6 week interval to the next session.

When is silicone gel sheeting useful and how should patients apply it?

Silicone gel sheeting is supported as both prevention after a high-risk wound (ear piercing, chest or shoulder surgery, burn excision in a keloid-prone patient) and as monotherapy or adjuvant for established keloids. Apply silicone gel sheets or topical silicone gel only on intact, healed skin — never over a scab or open wound. Patients should aim for 12–24 hours of contact per day for at least 2–3 months, removing only for hygiene; tapes that hold the sheet flat improve adherence on chest, shoulder and earlobe sites. Mild irritation, sweating under the sheet and itch are common; rotate the sheet site, allow short skin breaks and reinforce the long course needed for visible benefit.

Which body piercings carry the highest keloid risk and how should counselling change?

Earlobe and helical (cartilage) piercings dominate keloid case-series, with the helix being especially prone in adolescents and skin-of-color patients. Nipple, navel and lip piercings are next most often implicated. Counselling should: (1) ask about personal or family history of keloids before any piercing; (2) advise against elective piercings in known keloid-formers, especially on the ear cartilage and chest; (3) where a piercing has already produced a tender erythematous nodule, refer early — small post-piercing keloids respond far better to one or two early intralesional steroid injections plus pressure than to delayed treatment; (4) counsel realistically that re-piercing the same site after keloid removal carries a high recurrence risk.

What red flags should make me escalate a keloid earlier?

Same-day or same-week escalation is justified by sudden increase in pain, ulceration, foul discharge or visible pus (suspect superinfection), a lesion that is growing rapidly without preceding trauma, ulceration with a heaped indurated edge (consider dermatofibrosarcoma protuberans or carcinoma in chronic wounds), neurovascular compromise from a large lesion overlying a joint, and any pre-treatment patient with known systemic conditions that complicate steroid therapy (uncontrolled diabetes, recent live vaccine, immunosuppression). Refractory pruritus or psychological distress with self-harm thoughts also warrant earlier multidisciplinary review.

What does follow-up look like after a course of keloid treatment?

Schedule clinical review at 4–6 weeks after the final injection and again at 3, 6 and 12 months. Most recurrences appear within the first year, with the bulk before the 5-year mark. Document lesion height (using ruler or POSAS scale), surface dimensions, symptoms (pain and itch on a 0–10 scale), and adjuvant adherence (silicone hours/day, pressure garment use). Photograph at each visit with consent. Re-treat early at the first sign of regrowth — small recurrences respond far better than mature keloids. Plan for lifelong avoidance of unnecessary piercings, elective surgery on tension-prone sites and prompt management of acne flares.

  1. McGinty S, Siddiqui WJ. Keloid. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; updated 2023. (NCBI Bookshelf full text).https://www.ncbi.nlm.nih.gov/books/NBK507899/
  2. National Health Service (UK). Keloid scars.https://www.nhs.uk/conditions/keloid-scars/
  3. American Academy of Dermatology Association. Keloid scars: Diagnosis and treatment.https://www.aad.org/public/diseases/a-z/keloids-treatment
  4. American Academy of Dermatology Association. Keloid scars: Self-care.https://www.aad.org/public/diseases/a-z/keloids-self-care
  5. DermNet (NZ). Keloid and hypertrophic scar.https://dermnetnz.org/topics/keloid-and-hypertrophic-scar
  6. Mustoe TA, Cooter RD, Gold MH, et al. International clinical recommendations on scar management. Plastic and Reconstructive Surgery. 2002;110(2):560–571. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/12142678/
  7. Gold MH, Berman B, Clementoni MT, et al. Updated international clinical recommendations on scar management: Part 1—evaluating the evidence. Dermatologic Surgery. 2014;40(8):817–824. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/24816702/
  8. Ogawa R. Keloid and Hypertrophic Scars Are the Result of Chronic Inflammation in the Reticular Dermis. International Journal of Molecular Sciences. 2017;18(3):606. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/28287424/
  9. Limandjaja GC, Niessen FB, Scheper RJ, Gibbs S. The Keloid Disorder: Heterogeneity, Histopathology, Mechanisms and Models. Frontiers in Cell and Developmental Biology. 2020;8:360. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/32528951/
  10. O’Brien L, Pandit A. Silicon gel sheeting for preventing and treating hypertrophic and keloid scars. Cochrane Database of Systematic Reviews. 2006;(1):CD003826. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/16437463/
  11. MedlinePlus (US National Library of Medicine). Keloids.https://medlineplus.gov/ency/article/000849.htm
  12. Berman B, Maderal A, Raphael B. Keloids and Hypertrophic Scars: Pathophysiology, Classification, and Treatment. Dermatologic Surgery. 2017;43 Suppl 1:S3–S18. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/27583851/
  13. Ekstein SF, Wyles SP, Moran SL, Meves A. Keloids: a review of therapeutic management. International Journal of Dermatology. 2021;60(6):661–671. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/32905614/
  14. Mankowski P, Kanevsky J, Tomlinson J, et al. Optimizing radiotherapy for keloids: A meta-analysis systematic review comparing recurrence rates between different radiation modalities. Annals of Plastic Surgery. 2017;78(4):403–411. (PubMed citation).https://pubmed.ncbi.nlm.nih.gov/28230649/