Hyperpigmentation, or Post Inflammatory Hyperpigmentation (PIH) is the medical definition for the area of discolouration that is left following an inflamed area of skin. PIH can be left by many kinds of damage to the skin, but one of the most common is what we’d call ‘acne scars’ or macules – the kind of marks that can be left behind after a severe acne outbreak. How Hyperpigmentation treatments can help acne scars These macules...