Keloidal Scars - Causes, Treatment & When to See a Doctor

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What is Keloidal Scars?

Keloidal scars, commonly called keloids, are thick, raised, and often darkened patches of scar tissue that extend beyond the original borders of a wound. Unlike normal scars, keloids result from an over‑production of collagen during the healing process, causing the scar to grow larger and sometimes become itchy, painful, or cosmetically concerning. They can appear weeks to months after the skin injury has healed and may continue to enlarge for years if left untreated.

While keloids are benign (non‑cancerous), their appearance and symptoms can affect quality of life, especially when they occur on exposed areas such as the chest, shoulders, earlobes, or neck.

Common Causes

Keloids develop after any type of skin injury that triggers the normal wound‑healing cascade. Below are the most frequent precipitating events:

• Surgical incisions – especially after cosmetic, cardiac, or orthopedic procedures.
• Piercings – ear, lip, nose, or facial piercings are classic triggers.
• Acne or folliculitis – deep pustules or cystic acne can scar into keloids.
• Burns – both superficial and deep thermal injuries may result in keloid formation.
• Trauma – cuts, lacerations, abrasions, or animal bites.
• Vaccination sites – the deltoid region is a known location for post‑injection keloids.
• Dermatologic procedures – laser resurfacing, dermabrasion, or chemical peels.
• Elective cosmetic procedures – such as rhinoplasty or abdominoplasty.
• Infections – severe skin infections (e.g., staphylococcal cellulitis) may leave keloid scars.
• Genetic predisposition – families with a history of keloids (most common in African, Hispanic, and Asian populations).

Associated Symptoms

While some keloids are purely cosmetic, many patients experience additional symptoms:

• Itching (pruritus) – often described as a constant, irritating urge to scratch.
• Pain or tenderness – especially when the scar is stretched or traumatized.
• Burning or tingling sensation – due to nerve involvement in the hypertrophic tissue.
• Hyperpigmentation – the scar may appear darker than surrounding skin.
• Elevated, firm texture – the lesion feels rubbery and may be mobile over deeper structures.
• Growth over time – keloids can continue to expand for months or years.

When to See a Doctor

Although many keloids are harmless, you should schedule an evaluation if you notice any of the following:

• Rapid increase in size over a few weeks.
• Persistent pain, severe itching, or burning that interferes with daily activities.
• Signs of infection – redness, warmth, swelling, pus, or fever.
• Functional limitation (e.g., a keloid over a joint that restricts movement).
• Psychological distress due to the scar’s appearance.

Early intervention improves outcomes and can prevent larger, more resistant keloids.

Diagnosis

Diagnosis of keloidal scars is primarily clinical, based on history and physical examination. However, doctors may use additional tools to confirm the diagnosis or rule out other conditions:

1. Medical history – review of prior injuries, surgeries, piercings, family history, and timeline of scar development.
2. Physical examination – assessment of scar size, shape, color, texture, and relation to the original wound margin.
3. Dermatoscopy – a handheld device that magnifies skin structures; keloids show homogeneous, whitish fibrous tissue.
4. Biopsy (rare) – a small skin sample sent to pathology to exclude dermatofibrosarcoma protuberans or malignant melanoma when the lesion looks atypical.
5. Imaging (ultrasound or MRI) – reserved for large, deep, or function‑limiting keloids to evaluate involvement of underlying fascia or muscle.

Treatment Options

Treatment is individualized; no single modality works for everyone. Often, a combination approach yields the best results.

Medical & Procedural Therapies

• Intralesional corticosteroids (e.g., triamcinolone acetonide) – injected directly into the scar every 4–6 weeks; reduces collagen synthesis and inflammation.
• Silicone gel sheeting or sheets – applied continuously for 12–24 months; works by hydration and pressure, flattening the scar.
• Pressure therapy – specially fitted garments or clips that apply constant pressure (e.g., for earlobe keloids after piercing).
• Laser therapy – fractional CO₂ or pulsed‑dye lasers improve texture, redness, and height, especially when combined with steroids.
• Cryotherapy – freezing the keloid with liquid nitrogen; most effective for small lesions.
• 5‑Fluorouracil (5‑FU) or Mitomycin C injections – anti‑metabolite agents that inhibit fibroblast proliferation; often used together with steroids.
• Surgical excision – removal of the keloid followed by adjuvant therapy (steroids, radiation, or laser) to lower recurrence risk. Stand‑alone excision alone has a recurrence rate >50%.
• Radiation therapy – low‑dose external beam radiation administered within 24 hours after surgical removal; highly effective but reserved for refractory cases.
• Topical imiquimod – immune response modifier applied after excision; may reduce recurrence.

Home & Lifestyle Measures

• Keep the scar moisturized with petroleum‑jelly or silicone‑based ointments.
• Gentle massage (2–3 minutes, 2–3 times daily) using circular motions can soften the tissue.
• Avoid sun exposure; use broad‑spectrum sunscreen (SPF 30+) to prevent hyperpigmentation.
• Limit tension on the scar by wearing loose clothing and avoiding repetitive stretching.
• Consider over‑the‑counter antihistamines for mild itching, after discussing with a pharmacist.

Prevention Tips

Because keloids result from an overactive healing response, reducing skin trauma and early intervention are key.

• Know your risk – if you have a personal or family history of keloids, discuss preventive strategies with your surgeon or dermatologist before any procedure.
• Choose skilled professionals for piercings, tattoos, or surgeries; sterile technique and proper after‑care reduce complications.
• Apply silicone gel sheets early (within 2–3 weeks of wound closure) for high‑risk sites.
• Use pressure garments after burns or large surgical incisions, especially on the chest, shoulders, or limbs.
• Avoid unnecessary skin trauma – limit aggressive scratching, picking, or repeated minor injuries.
• Promptly treat infections – early antibiotic therapy prevents inflammatory cascades that can promote keloid formation.
• Consider prophylactic steroid injections at the time of surgery for patients known to develop keloids.

Emergency Warning Signs

References

• Mayo Clinic. Keloid scars: Treatment options. 2023. https://www.mayoclinic.org
• Cleveland Clinic. Keloids: Causes, symptoms, and treatment. 2022. https://my.clevelandclinic.org
• National Center for Biotechnology Information (NCBI). “Keloid pathogenesis and therapy.” *Dermatologic Surgery*, 2021.
• World Health Organization. Guidelines for wound management. 2020.
• American Academy of Dermatology. Silicone gel sheeting for hypertrophic and keloid scars. 2022.

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