Melasma is a common skin problem causing patchy brown, tan, or blue-gray facial skin discoloration. It is mostly found on the upper cheeks, upper lip, forehead, and chin. It is most commonly found in women 20-50 years of age. One of the main causes of melasma is related to external sun exposure. It is common amongst pregnant women and hormones seem to trigger melasma. Your dermatologist can help you treat it with topical creams or laser.