09/03/2026
Knowing Your Acne Scars 🤔
Not all acne scars are the same — and identifying the type of scar is an important first step before selecting the appropriate treatment.
Changes after acne generally fall into three broad categories:
• Atrophic scars – depressed or indented scars caused by loss of collagen during the healing process. Common forms include ice-pick, boxcar, and rolling scars.
• Hypertrophic or keloid scars – raised scars caused by excess collagen formation during healing.
• Post-acne marks – flat discoloration that can appear red (post-inflammatory erythema, PIE) or brown (post-inflammatory hyperpigmentation, PIH) following inflammation.
Many patients have a mixture of these changes at the same time, which is why acne scar management often involves different treatment modalities tailored to the specific scar types present.
🎥 In this video, Dr Chiam explains how doctors assess acne scars and why accurate classification is important before planning treatment.
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