What Scar Tissue Is Made Of — and Why Some Scars Stay Forever

Skin Biology · Scar Science · Rawang Selangor

Every scar tells a biological story. Understanding what scars are made of, why some fade and others grow, and what treatments genuinely remodel them changes the way you approach scar management entirely.

📅 May 2026  |  Vivardi Clinics, Rawang

Scars are the skin’s emergency repair system — fast, functional, and imperfect. When skin is injured deeply enough to damage the dermis, the body prioritises structural closure over perfect restoration. The result is scar tissue: collagen that is strong but different from the skin it replaces. Understanding why this happens, and why some scars refuse to fade, is the foundation of effective scar management.

How Scar Formation Works: The Three Phases

Every scar follows the same biological sequence, regardless of whether it is from a cut, burn, acne, or surgery. This sequence occurs in three overlapping phases:

Phase 1: Haemostasis and Inflammation (Days 1-7)

Immediately after injury, blood clotting mechanisms activate and platelets aggregate to seal the wound. Inflammatory cells — neutrophils first, followed by macrophages — flood the area to kill bacteria and clear debris. This is the redness, swelling, and warmth you see in a fresh wound. Macrophages release growth factors (including PDGF and TGF-beta) that recruit fibroblasts to begin the repair process.

Phase 2: Proliferation (Weeks 1-4)

Fibroblasts migrate into the wound and begin producing collagen at high speed. The priority here is structural: close the wound as quickly as possible. The collagen produced in this phase is primarily collagen type III — thinner, weaker, and less organised than the collagen type I that predominates in normal skin. It is deposited in thick parallel bundles aligned to the direction of wound tension rather than in the basket-weave lattice of normal dermis. New blood vessels form to support the highly active repair tissue.

Phase 3: Remodelling (Months 1-24)

This is the longest and most variable phase. Over weeks and months, collagen type III is gradually replaced by stronger collagen type I, and the scar reorganises and contracts. Excess blood vessels recede. The raised, red appearance typical of fresh scars usually softens and fades significantly during this phase. Remodelling can continue for up to two years after injury.

What Scar Tissue Is Physically Different From Normal Skin

Why Some Scars Fade and Others Never Do

The outcome of a scar depends on multiple variables working together:

• Wound depth: Injuries that only reach the epidermis (sunburn, superficial grazes) heal without scarring. Only wounds that penetrate the dermis produce permanent scars, because dermis is not regenerated — it is replaced with scar collagen.
• Wound tension: Areas under high mechanical tension (shoulders, chest, joints) produce more prominent scars because fibroblasts deposit more collagen when the wound edges are being pulled apart.
• Infection: Infected wounds trigger a more intense and prolonged inflammatory phase, resulting in more collagen deposition and more prominent scarring.
• Genetics: Some individuals have fibroblasts that are constitutionally more active and produce more collagen in response to injury. This predisposition runs in families and is more common in people with darker skin tones.
• Age: Paradoxically, younger skin scars more prominently than older skin because fibroblast activity is higher. However, younger skin also remodels more effectively over time.
• UV exposure: Post-inflammatory hyperpigmentation — the dark marks left after acne or skin injury — is dramatically worsened by UV exposure during healing. SPF50 during scar formation is not optional; it is clinical.

The Three Main Scar Types and What Makes Each Different

Normotrophic Scars (Flat Scars)

These scars are level with the surrounding skin, may be lighter or darker than surrounding skin, and represent the best-case outcome of normal wound healing. Over 1-2 years, they typically fade to a thin, pale line. Most minor cuts and healed acne fall into this category.

Hypertrophic Scars (Raised but Contained)

Hypertrophic scars are raised, firm, and often pink or red, but crucially they stay within the boundaries of the original wound. They result from excessive collagen deposition but with a fibroblast response that eventually self-regulates. Most improve significantly over 12-24 months with or without treatment, though treatment accelerates this process considerably.

Keloid Scars (Raised and Expanding)

Keloids represent an abnormal fibroblast response where collagen production does not self-regulate. They grow beyond the original wound boundaries, can continue expanding for years, and have no spontaneous resolution without treatment. They are significantly more common in individuals with Fitzpatrick skin types IV-VI — which includes most Malaysians of Malay, Indian, and some Chinese descent. Keloids have a strong genetic component and tend to occur on the chest, upper back, shoulders, and earlobes.

Acne Scars: A Special Category

Acne scars deserve specific mention because they are the most common scar type seen in clinical aesthetic practice in Malaysia. They are not all the same, and the treatment must match the scar type:

• Atrophic (depressed) scars: The most common type. Skin tissue is lost, leaving an indentation. Subtypes include icepick scars (narrow, deep), boxcar scars (wider, defined edges), and rolling scars (soft waves in the skin surface). Caused by inflammatory destruction of collagen during active acne.
• Post-inflammatory hyperpigmentation (PIH): Not a true scar but a pigmentation change left after acne heals. Very common in Malaysian skin. Responds well to Pico laser and brightening agents.
• Post-inflammatory erythema (PIE): Pink or red discolouration from dilated blood vessels after acne healing. Different from PIH and responds better to treatments targeting vasculature.

Clinical Treatments That Genuinely Remodel Scars

What You Can Do at Home During the Remodelling Phase

1. SPF50 daily without exception. UV exposure during the remodelling phase significantly worsens pigmentation and slows collagen reorganisation. This is the single most impactful thing you can do for a new scar.
2. Silicone sheets or gel. The best-evidenced OTC scar treatment. Hydrates the scar, reduces TEWL, and modulates fibroblast activity. Most effective on fresh, raised scars used consistently for 3-6 months.
3. Avoid picking. Re-injuring a healing scar resets the inflammatory phase, leads to more collagen deposition, and significantly worsens the outcome.
4. Massage. Gentle circular massage of a healed (not fresh) scar helps break down the parallel collagen bundles and improves pliability over time. Particularly useful for hypertrophic scars.
5. Vitamin C serum. A cofactor for collagen synthesis and an antioxidant. Applied to healed scars, it can improve pigmentation and support more organised collagen production.

Frequently Asked Questions