Post-Inflammatory Hyperpigmentation
Post-inflammatory hyperpigmentation (PIH) is an acquired form of hyperpigmentation that results from excessive melanin deposition following skin inflammation. It presents as flat, darkened patches or spots — typically brown in lighter skin tones and dark grey or purple in darker skin tones — corresponding to the location of the preceding inflammation or injury.
How to Avoid PIH After Laser
PIH risk after laser treatment is strongly influenced by skin type — Fitzpatrick skin types III–VI (most common in Singapore and Southeast Asia) are at significantly higher risk. Key prevention steps: strict daily SPF 50 protection before and after treatment, avoiding sun exposure during the healing period, using prescribed post-laser recovery serums, and not picking scabs or disturbing the treated area.
Treatment of Established PIH
For established PIH, Dr Sin Yong uses a combination of topical brightening agents (tranexamic acid, azelaic acid, kojic acid, niacinamide) and carefully selected laser protocols at sub-inflammatory settings. The goal is to fade the existing pigmentation without triggering further melanin production in the inflammatory response.
PIH can take months to fade naturally. With appropriate treatment, the timeline can be shortened — but patience and strict sun protection are non-negotiable components of recovery.