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Melasma is a dark skin discoloration that occurs on sun-exposed areas of the face. It is generally characterized by a brown color over the cheeks, forehead, nose and/or upper lip. It is often symmetrical, matching on both sides of the face.
Skin discoloration can have many causes, ranging from cosmetic issues to more complex skin issues. The hormones estrogen and progesterone can cause a discoloration known as melasma or chloasma, particularly in women who are pregnant, taking oral contraceptives or on hormone replacement therapy [source: U.S. National Library of Medicine].