Melasma is a common skin condition in which brown or gray-brown patches develop on the face. Melasma commonly forms on the forehead, bridge of the nose, cheeks, lips and chin and other areas of the body that get a lot of sunlight. Women are more likely to develop this condition than men, and it is sometimes called the “mask of pregnancy” because it commonly occurs at that time.

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The cause of melasma isn’t clear, but it occurs when melanocytes (the color-making cells in the skin) produce too much color. This condition is triggered by:

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• Changes in hormones (caused by pregnancy, birth control pills or hormone replacement medicine)

• Sun exposure, as UV rays stimulate melanocytes