Hyperpigmentation of the skin isn’t uncommon, but unlike your run-of-the-mill sun spots, melasma is arguably one of the most clingy and temperamental skin conditions to treat once it appears. Melasma, which appears as irregular dark patches along the forehead, upper lip and cheeks, is sometimes called “the mask of pregnancy” because it often occurs in response to hormonal changes associated with pregnancy or the use of oral contraceptives, said Dr. Brendan Camp, a board-certified dermatologist in New York City.
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