Dark spots after a pimple: understanding post-inflammatory hyperpigmentation

Post-inflammatory hyperpigmentation (PIH) is the skin's version of a bad memory: after any injury, a pimple, a rash, a burn from a harsh product, the skin deposits extra pigment where the inflammation happened.

The chain: injury → inflammation → pigment cells activated → dark spot. Fading the spot while the trigger keeps firing is like mopping a floor with the tap still running. So the first consultation for dark spots is really a consultation about causes.

With the trigger controlled, PIH fades on a predictable timeline: superficial marks respond in 6–10 weeks to azelaic acid, retinoids and vitamin C; deeper marks may need peels or careful laser, always with settings suited to melanin-rich skin.

And the non-negotiable at every stage: sunscreen. UV keeps reactivating pigment cells. A dark-spot routine without daily SPF 50 is a car with an accelerator and no brakes.