Melasma is a skin condition where brown patches appear on the skin. These patches usually appear on the cheeks, nose, forehead, chin, and upper lip. Patches can also appear on the neck and forearms.

Because it is common in pregnant women, melasma may be referred to as the mask of pregnancy.

Common Sites on the Face for Melasma
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The brown patches are due to an increased amount of melanin in the skin. The exact cause of increase in melanin is unknown. It is thought to be associated with hormones such as estrogen and progesterone. Sun exposure also plays a major role.