Scars: Formation, Types, Treatment, and Prevention

Why Scars Form

A scar is the body's natural repair after dermal injury—fibrous collagen replacing normal skin architecture. While inevitable with deep injury, appearance and symptoms can be optimized. Injury → inflammation → proliferation (fibroblasts deposit collagen III → I) → remodeling (months-years). Normal healing: organized collagen lattice. Scarring: excessive, disorganized collagen, absent adnexal structures (hair, glands), reduced elasticity.

Scar Types

• Fine line: Normal healing; flat, pale, minimally visible.
• Atrophic: Depressed (icepick, boxcar, rolling)—acne, chickenpox, trauma. Collagen loss.
• Hypertrophic: Raised, red, within wound boundaries. Peaks 3–6 months; may regress over years.
• Keloid: Raised, extends beyond original wound. No regression. Higher in darker skin (Fitzpatrick IV–VI), ears, chest, shoulders, jawline. Genetic predisposition.
• Contracture: Crosses joints → functional limitation. Burns, deep trauma.
• Striae (stretch marks): Dermal tearing from rapid stretching (pregnancy, growth, weight). Atrophic variant.

Treatment by Type and Maturity

Early (Immature, <1 year) – Active Remodeling Window

• Silicone gel/sheeting: Gold standard non-invasive. Hydration, occlusion, ↓ TGF-β. 12–24 hrs/day × 3–6 months.
• Pressure therapy: Custom garments for burns/large scars. 23 hrs/day.
• Sun protection: SPF 50+ prevents hyperpigmentation (scars lack melanocyte regulation).
• Massage: Mechanical remodeling, ↓ adhesions, ↑ pliability.
• Topicals: Centella asiatica, onion extract (modest), retinoids (atrophic).

Established Scars – Procedural

• Laser: Fractional CO₂/Er:YAG (ablative)—collagen remodeling, texture. PDL (pulsed dye)—erythema, vascularity. Non-ablative fractional—less downtime.
• Microneedling ± RF: Collagen induction; atrophic scars, striae.
• Injectables: Corticosteroids (kenalog)—hypertrophic/keloid. 5-FU, bleomycin adjuncts. Fillers (HA)—atrophic. Botox—tension reduction (preventive).
• Surgical: Excision + tension-free closure ± adjuvant (radiation, steroids, pressure) for keloids. Z-plasty, W-plasty, geometric broken-line for contractures. Subcision for tethered atrophic scars.

Prevention (Peri-Procedural and Post-Injury)

• Meticulous closure: eversion, minimal tension, atraumatic technique
• Early silicone (once epithelialized)
• Strict sun protection × 12–18 months
• No picking scabs; moist wound healing (petrolatum + occlusive)
• Control inflammation: NSAIDs, avoid infection
• Nutrition: Protein, vitamin C, zinc, arginine

When to See a Specialist

• Keloids, contractures, functional impairment
• Cosmetic distress despite conservative care
• Suspicious changes (ulceration, rapid growth—rule out malignancy)

Scars tell a story of healing. With modern tools, that story can be far less visible.