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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.
Excess sun exposure is the main cause of skin discoloration. Skin discoloration is normally a result of the skin's natural pigmentation, called melanin, overproducing in any given area. This discoloration affects the topmost layer of skin, leaving you with brown patches. The main culprit in melanin overproduction is excess sun exposure.