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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 be caused by more complicated underlying conditions. Vitiligo is a condition in which your melanin-making cells stop working or die. The result is patches of white, colorless skin that start out small but then spread [source: Mayo Clinic]. Tinea versicolor is a fungal infection encouraged by warm, humid weather that results in small, discolored areas of skin, which can also be scaly [source: Mayo Clinic].