Melasma is an inflammatory skin disorder in which dark patches appear on the face (forehead, cheeks, and upper lip). It is due to excessive pigment (melanin) collecting in the skin. The dark patches usually have distinct edges and are symmetrical (similar on both sides of the face). When it occurs during pregnancy, it is often referred to as “chloasma” or the “mask of pregnancy.” Common triggers are bright sunlight and heat.

Melasma is very common and occurs in up to six million American women. Although people with melasma may be concerned about its appearance, it is a harmless condition that causes no other health problems.