Melasma typically occurs in dense patches of pigmented skin on the forehead, cheeks, upper lip, chin, and jawline. The patches are brown, tan or gray in color. Melasma can also present in other areas of the body, such as the arms and chest, especially if they have regular exposure to the sun. Your dermatologist may classify your melasma according to where it appears on the facial skin: centrofacial (forehead, cheeks, above the lip and chin), malar (cheeks and chin) and ramus (jawline).