Quick Answer
Scars are divided into five main categories based on their clinical appearance and histopathological features: normotrophic, hypertrophic, keloid, atrophic, and contracture. Atrophic scars are further sub-classified as ice pick, rolling, and boxcar. Accurate classification plays a decisive role in treatment selection; incorrect diagnosis causes even the most effective treatments to fail. Virtuana Clinic in Kocaeli/Izmit integrates laser, filler, steroid, and abrasion protocols according to scar type into a single treatment plan.
What Is a Scar? Histological and Clinical Definition
A scar (cicatrix) is repair tissue synthesised by fibroblasts in response to full-thickness skin injury, consisting largely of collagen types I and III. Normal scar tissue differs from healthy skin in several critical respects:
- It contains no hair follicles or sweat glands
- Collagen fibres are arranged in parallel rather than randomly
- The epidermal-dermal junction (rete ridges) is flattened
- Elastin content is significantly reduced
- Vascularisation is initially increased and decreases as the scar matures
These differences determine the appearance, elasticity, and colour of a scar. The type of scar that forms is shaped by wound depth, the presence of infection, individual genetic predisposition, and the quality of wound management.
Scar Classification: Five Main Categories
| Scar Type | Surface Level | Margins | Spontaneous Regression | Common Location |
|---|---|---|---|---|
| Normotrophic | Flush with skin | Within wound margins | Yes, fades over time | Any area |
| Hypertrophic | Raised above skin | Within wound margins | Partially (over 1–3 years) | Chest, shoulder, joint |
| Keloid | Markedly raised | Extends beyond wound margins | No | Ear, sternum, shoulder |
| Atrophic | Below skin surface | Defined / depressed | No | Face (acne scars), body |
| Contracture | Spans a large area | Encircles joint region | No; progressive | Burns, hand, neck |
Normotrophic Scar: The Result of Normal Wound Healing
A normotrophic scar is a scar tissue that forms when the physiological course of wound healing is complete; it lies flush with the skin surface, fades, and narrows over time. Its appearance may initially be reddish or purple, gradually taking on a pale white or skin-toned colour over 12–24 months.
Treatment is generally for cosmetic purposes; laser resurfacing or dermabrasion can significantly improve the contour and colour of a normotrophic scar.
Hypertrophic Scar: Excessive Healing That Stays Within Bounds
A hypertrophic scar forms when collagen production during the proliferative phase becomes excessive; however, fibroblast activity slows over time and partial spontaneous regression may occur. The distinguishing feature is that the scar remains within the wound boundaries.
Histologically, collagen fibres form irregular, whirl-like nodules. Clinical features include:
- Redness (erythema), warmth, and itching
- A tense, inelastic tissue feel
- Restricted movement at joint areas
- Becoming apparent within 4–8 weeks of onset
Treatment: Silicone gel (first line), triamcinolone injection, fractional laser, pulsed dye laser (PDL), and pressure therapy combination.
Keloid: Uncontrolled Growth Beyond Wound Boundaries
Keloid differs significantly from hypertrophic scar both histopathologically and clinically. Fibroblasts are resistant to apoptosis; they continue producing collagen without responding to the normal "stop" signal. As a result, keloids extend beyond the wound boundaries into surrounding healthy tissue and do not undergo spontaneous regression.
High-risk sites for keloid formation: the earlobe (45% of all keloids), anterior chest, deltoid region of the shoulder, upper back, and jaw.
| Feature | Hypertrophic Scar | Keloid |
|---|---|---|
| Margins | Stays within wound | Extends beyond wound |
| Spontaneous regression | Partial (50%, over 1–3 years) | No; continues to grow |
| Genetic predisposition | Moderate | Strong; familial pattern |
| Recurrence after surgery | 15–30% | 50–100% (surgery alone) |
| Histology | Irregular collagen, few fibroblasts | Thick keloid fibres (hypercellular) |
Atrophic Scars: Depressed Scar Types
Atrophic scars form when collagen production is insufficient during wound healing, or when existing collagen is broken down by inflammation. They lie below the skin surface and are divided into three subtypes according to their depth. This classification directly determines treatment selection.
Ice Pick Scar
The deepest and narrowest type of atrophic scar. It presents as deep, narrow channels that appear as if left by a sharp-tipped piercing instrument. Diameter is generally less than 2 mm, and depth can extend to the lower layers of the dermis or even into the subcutaneous tissue. It forms following deep inflammatory acne lesions (nodules, cysts) in which collagen production was severely inadequate.
Treatment: TCA CROSS (Chemical Reconstruction of Skin Scars) is the most effective approach; high-concentration TCA (80–100%) is applied focally, stimulating the base of the channel to promote filling. Fractional ablation is a supportive adjunct.
Rolling Scar
Wide-based depressions with rounded edges; they become more prominent when the skin is slightly stretched due to fibrous bands tethering the skin surface. They are generally 4–6 mm in diameter and cause a wave-like appearance of the surface. Contraction of fibrous bands connecting the deep dermis to the subcutaneous tissue is the primary mechanism.
Treatment: Subcision is the first choice; the cannula movement cutting the fibrous bands under the skin releases the depression, followed by PRP or filler for volume support. Results are generally very good.
Boxcar Scar
Depressions with sharply defined vertical edges and a wide base; their cylindrical or rectangular shape is likened to a pockmark. They may be shallow (0.1–0.5 mm) or deep (>0.5 mm); deeper ones may be confused with ice pick scars. Commonly seen following chickenpox (varicella) and acne cysts.
Treatment: Fractional laser (CO2 or Er:YAG) and punch excision + graft combination. Punch elevation is appropriate for deep boxcar scars.
Atrophic Scar Types: Comparison Table
| Feature | Ice Pick | Rolling | Boxcar |
|---|---|---|---|
| Appearance | Deep, narrow pinhole | Wave-like, wide depression | Vertical edges, flat base |
| Diameter | <2 mm | 4–6 mm | 1.5–4 mm |
| Depth | Very deep (to subcutaneous) | Shallow–moderate | Shallow or deep |
| First-Line Treatment | TCA CROSS | Subcision + PRP/filler | Fractional laser / punch |
| Treatment Response | Moderate (requires prolonged treatment) | Good | Moderate–good (depends on depth) |
Contracture Scar: Deep Scar Causing Restricted Movement
Contracture scars develop following deep tissue damage over large areas (particularly burns). As the scar tissue matures, it shortens by contracting; if this shortening encircles joint areas it leads to restricted movement and deformity. The hand, neck, axilla (armpit), and knee are the most commonly affected joint regions.
Treatment may require plastic surgery; Z-plasty, free flap, or skin graft procedures are used to restore functional capacity. Physical therapy and early use of pressure garments can delay the development of contracture.
Scar Grading Tools: POSAS and VSS Scoring
Clinical scoring tools are used in scar treatment both to assess the baseline level and to measure response to treatment:
- VSS (Vancouver Scar Scale): Four parameters covering colour, pliability, height, and vascularity; scores range from 0–13. Widely used for monitoring hypertrophic scars and keloids.
- POSAS (Patient and Observer Scar Assessment Scale): Incorporates both physician and patient perspectives; 11 parameters. Considered the gold standard in clinical research.
- High-frequency ultrasound (echography): Objectively measures scar thickness and hydration; used at Virtuana Clinic to monitor treatment response.
Acne Scar Classification: The Goodman–Baron System
The most widely used classification system for acne scars was published by Goodman and Baron in 2006. Four grades are defined:
- Grade 1 (Macular): Flat, pink-red or hyperpigmented mark; no tissue depression. Coverable with makeup. Treatment may not be required, or IPL for colour correction may suffice.
- Grade 2 (Shallow Atrophic): Mild depression; visible when viewed from 50 cm. Good response to subcision, fractional laser, and chemical peeling.
- Grade 3 (Moderate–Deep Atrophic): Pronounced depression; noticeable at normal social distances, partially flattens with stretching. Aggressive fractional laser + subcision combination.
- Grade 4 (Deep Atrophic / Hypertrophic): Deep depressions or raised scar; no improvement with stretching. A surgical + laser multimodal approach is required.
Virtuana Clinic Scar Assessment Protocol: Kocaeli/Izmit
At Virtuana Clinic, we conduct a comprehensive classification and assessment process before commencing scar treatment. This process includes:
- Clinical and dermoscopic evaluation: Scar type, age, size, and skin tone are determined.
- Photography and POSAS/VSS scoring: Objective documentation before and after treatment.
- Skin tone analysis (Fitzpatrick scale): Laser parameters and procedure selection differ for darker skin tones.
- Risk stratification: Keloid predisposition, active acne, and systemic conditions are assessed.
- Personalised treatment plan: A protocol tailored to the scar type; typically structured as a rehabilitation programme of 3–6 sessions.
The majority of patients presenting at our clinic in Kocaeli and Izmit have more than one scar type concurrently. For this reason, rather than a single treatment approach, hybrid protocols — such as the combination of TCA CROSS + subcision + fractional laser — deliver the most comprehensive and rapid results.
This article is for informational purposes only. Please consult a qualified physician for treatment decisions.