Postinflammatory Hyperpigmentation

Abstract

This acquired excess of pigment can be attributed to various preceding disease processes that affect the skin such as infections, allergic reactions, mechanical injuries, reactions to medications, phototoxic eruptions, trauma-like burning, and inflammatory diseases. This frequently follows lichen planus or lichen sclerosus in which the pigmentation may be persistent. It can develop on scars (obstetrical, gynecological).