Chloasma (melasma) is a pigmentation disorder of the skin that occurs almost invariably in women, and more commonly in those with a dark complexion. The deposits of pigment on the forehead, cheeks, upper lip, nose and nipples are often triggered by pregnancy or starting the oral contraceptive pill. This pigmentation is sometimes referred to as the mask of pregnancy.
Treatment is unsatisfactory. Numerous blanching agents have been tried with minimal success, but the pigmentation usually fades slowly over several years.