Can post-inflammatory hyperpigmentation be prevented?

Post-inflammatory hyperpigmentation, often called PIH, is extra pigment left after skin inflammation or injury settles. It may follow acne, eczema flares, insect bites, burns or irritation. The mark can look brown, grey or darker than the surrounding skin, and its shade may vary with skin tone and the depth of inflammation. PIH is not contagious. Preventing every mark is difficult because the skin response differs between people, but reducing repeated irritation lowers the chance of pigment becoming more noticeable.

Manage the original problem rather than squeezing spots, scratching itchy areas or repeatedly rubbing the skin. Use a gentle cleanser and moisturiser, and introduce active products gradually to avoid avoidable irritation. Protect exposed healing areas from sunlight with clothing or broad-spectrum sunscreen; light can deepen existing marks. Stop a product that causes burning, swelling or a persistent rash. A dermatologist can select treatment for acne or dermatitis and decide whether a pigment treatment is appropriate after inflammation is controlled.

Book a review when new dark marks keep appearing, the underlying rash or spots are not settling, or a product is causing ongoing irritation. Seek prompt care for rapidly changing pigmentation with pain, bleeding, ulceration or a new lump. A clinician can check whether the colour change is PIH or another condition and address the trigger before considering fading treatment.

What is causing my inflammation, and how can I control it without irritating my skin? Which sunscreen and cleanser fit my skin? When is it appropriate to treat the pigment itself?