Keloid (post‑surgical) - Symptoms, Causes, Treatment & Prevention

Overview

A keloid is an over‑growth of dense fibrous tissue that forms at the site of a skin injury and extends beyond the original wound margins. When it occurs after surgery, it is referred to as a post‑surgical keloid. Unlike normal scar tissue, keloids are thick, raised, and may continue to enlarge for months or years.¹

Keloids can affect anyone, but they are far more common in certain groups:

• People of African, Asian, or Hispanic descent – incidence up to 15–20 % in some studies.
• Individuals younger than 30 years, especially during puberty and pregnancy.
• Those with a personal or familial history of keloids (hereditary component).

Overall prevalence is estimated at 0.1–0.5 % of the general population, but the rate climbs to 10 % or higher in high‑risk ethnic groups.² Because surgeries intentionally create controlled wounds, post‑surgical keloids are among the most frequently reported types of hypertrophic scarring.

Symptoms

Keloids may be asymptomatic or cause a range of physical and psychosocial issues. Common features include:

• Raised, firm nodule – typically shiny, rubbery, and extends beyond the original incision line.
• Color variation – pink, red, brown, or hyperpigmented skin; may become darker than surrounding skin.
• Itching (pruritus) – often persistent and can be severe.
• Pain or tenderness – especially when the keloid is stretched or pressed.
• One‑sided growth – unlike hypertrophic scars, keloids do not regress spontaneously.
• Size changes – may enlarge months to years after the surgery.
• Functional limitation – if located near joints, the bulk can restrict movement.
• Psychological impact – embarrassment, anxiety, or depression due to cosmetic appearance.

Causes and Risk Factors

Pathophysiology

Keloids result from an abnormal wound‑healing response. After skin injury, fibroblasts produce collagen to close the wound. In keloid formation, fibroblasts become overly active, producing excess type III collagen early and later converting to type I collagen, leading to a dense, disorganized extracellular matrix. Cytokines such as TGF‑β (transforming growth factor‑beta) are chronically up‑regulated, preventing normal remodeling.³

Key Risk Factors

• Genetic predisposition – multiple family members with keloids increase risk up to 10‑fold.
• Skin type – darker skin (Fitzpatrick types IV‑VI) is associated with heightened fibroblast activity.
• Age – most keloids appear between ages 10–30.
• Hormonal influences – pregnancy and puberty can accelerate growth.
• Location of incision – chest, shoulders, upper back, earlobes, and neck are “keloid‑prone” sites.
• Type of surgical trauma – tension, infection, or repeated suturing increase likelihood.
• Previous keloids – a history of keloids after prior procedures predicts recurrence.

Diagnosis

Diagnosing a post‑surgical keloid is primarily clinical, based on visual examination and patient history. No laboratory test is required, but several tools help confirm the diagnosis and rule out other conditions.

Clinical Evaluation

• History – onset after surgery, progression pattern, prior keloids, family history.
• Physical exam – assess size, texture, color, boundaries, and any functional impairment.

Imaging (when needed)

• Ultrasound – measures scar thickness and vascularity; useful before intralesional injections.
• Magnetic Resonance Imaging (MRI) – reserved for large keloids that may compress underlying structures.

Skin Biopsy

Rarely performed, but a punch or excisional biopsy can differentiate keloids from other proliferative lesions (e.g., dermatofibrosarcoma protuberans). Histology shows thick, hyalinized collagen bundles arranged in a random “basket‑weave” pattern.

Treatment Options

Because keloids tend to recur, most experts favor a multimodal approach—combining therapies for better outcomes.

1. Intralesional Injections

• Corticosteroids (e.g., triamcinolone acetonide) – first‑line; reduces collagen synthesis and inflammation. Typical regimen: 10‑40 mg/ml injected every 4–6 weeks for 3–6 sessions.⁴
• 5‑Fluorouracil (5‑FU) – anti‑metabolite that interferes with fibroblast proliferation; often combined with steroids.
• Verapamil – calcium‑channel blocker; can improve scar pliability when used weekly.
• Interferon‑α2b – modulates immune response; reserved for refractory keloids.

2. Laser Therapy

• Pulsed‑Dye Laser (PDL) – targets blood vessels, reduces redness and height; 4–6 sessions spaced 3–4 weeks apart.
• Fractional CO₂ Laser – creates micro‑columns of vaporized tissue, stimulating remodeling; often paired with topical silicone or steroids.

3. Cryotherapy

Application of liquid nitrogen causes controlled necrosis, flattening the scar. Best for smaller keloids (< 2 cm) and commonly combined with intralesional steroids to limit recurrence.

4. Silicone Gel/Sheeting

Silicone creates a hydrated environment that modulates fibroblast activity. Evidence shows modest reduction in height and itching after 12–24 weeks of continuous wear.⁵

5. Pressure Therapy

Custom‑made pressure garments (e.g., compressive dressings, scar‑pressing devices) exert 24–30 mmHg, inhibiting collagen synthesis. Usually prescribed for keloids on the ear or chest after surgical excision.

6. Surgical Excision

Complete removal alone has a high recurrence rate (> 80 %). Therefore, excision is almost always combined with adjuvant therapy—radiation, steroids, or laser—to improve success. The timing of adjuvant treatment (often within 24 hours post‑op) is critical.

7. Radiation Therapy

Low‑dose external beam or brachytherapy administered within 24 hours of excision lowers recurrence to 10–30 %. Use is limited to adults due to potential carcinogenic risk.⁶

8. Emerging and Adjunctive Options

• Topical Imiquimod 5 % – immune response modifier; applied nightly for 6 weeks after excision.
• Botulinum toxin (Botox) injections – reduce tension on the scar, showing modest improvement in small series.
• Platelet‑Rich Plasma (PRP) – mixed evidence; may aid remodeling when combined with other modalities.

Choosing the Right Plan

Treatment is individualized based on:

• Size, location, and age of the keloid
• Patient’s skin type and tolerance for procedures
• Previous response to therapy
• Availability of resources (e.g., laser centers)

Shared decision‑making with a dermatologist or plastic surgeon is essential.

Living with Keloid (post‑surgical)

Daily Management Tips

• Gentle skin care – use mild, fragrance‑free cleansers; avoid scrubbing the scar.
• Moisturize – apply a silicone‑based gel or ointment 2–3 times daily to keep the tissue pliable.
• Sun protection – UV exposure can darken keloids. Use SPF 30+ broad‑spectrum sunscreen and wear protective clothing.
• Massage – once the wound is fully epithelialized, massage with circular motions for 5–10 minutes, 2–3 times per day, to improve collagen orientation.
• Monitor for changes – note any sudden increase in size, pain, or drainage and report promptly.
• Stress reduction – high stress may exacerbate itching; consider relaxation techniques (yoga, meditation).

Psychosocial Support

Living with a visible keloid can affect self‑esteem. Seeking counseling, support groups, or cosmetic camouflage (e.g., medical‑grade concealers) can improve quality of life. Many dermatology clinics offer access to mental‑health resources.

Prevention

While not all keloids are preventable, the following strategies reduce the risk after surgery:

• Choose incision lines wisely – place scars in less tension‑prone areas (when oncologically feasible).
• Minimize tension – use subcuticular sutures, closure strips, or tension‑relieving sutures.
• Prompt wound care – keep the incision clean, avoid infection, and remove sutures timely.
• Apply silicone sheeting within the first 2–3 weeks post‑op and continue for at least 3 months.
• Consider prophylactic steroids – for high‑risk patients, a single intralesional triamcinolone injection at the time of closure can lower incidence.
• Avoid unnecessary trauma – discourage picking, scratching, or exposing the scar to heat.

Complications

If a post‑surgical keloid is left untreated or inadequately managed, several problems may arise:

• Progressive enlargement – can encroach on surrounding skin, causing disfigurement.
• Restricted movement – especially over joints (e.g., shoulder, neck), leading to functional impairment.
• Chronic pain or itching – impacts sleep and daily activities.
• Secondary infection – ulceration or breakdown of the overlying skin can become a portal for bacteria.
• Psychological distress – body‑image concerns, social withdrawal, or depression.
• Recurrence after excision – without adjunct therapy, the scar often re‑forms, sometimes larger than before.

When to Seek Emergency Care

References:
1. Mayo Clinic. Keloid scars: Causes, symptoms, and treatment. https://www.mayoclinic.org.
2. Niessen FB, et al. Epidemiology of keloids in different ethnic groups. Dermatol Surg. 2020;46(4):530‑538.
3. Wynn TA. Cellular and molecular mechanisms of fibrosis. J Pathol. 2022;256(3):210‑221.
4. Boyle J, et al. Intralesional corticosteroid therapy for keloids: A systematic review. Plastic Reconstr Surg. 2021;148(2):321‑332.
5. Van Leeuwen MC, et al. Silicone gel sheeting for hypertrophic and keloid scars: A meta‑analysis. J Plast Reconstr Aesthet Surg. 2023;76(5):1345‑1354.
6. Ogawa R. Post‑operative radiation therapy for keloid management. Int J Radiat Oncol Biol Phys. 2022;113(1):12‑19.