Melasma is a chronic skin condition that affects many men and women, and is more commonly found in people of Asian or Latin ethnicity. It is a type of hypermelanosis, or overproduction of melanin. It appears as large brown macules covering the side the cheeks, the entire face, the forehead, nose, chin, or upper lip. There are many causes for melasma: genetics, pregnancy, hormones, sun exposure, heat, and environment—there is no one specific reason. Unfortunately, melasma is a chronic condition, and once you have it, it will likely remain for several years. Also, if untreated, it can worsen and/or spread over time