Definition:
Melasma is a brown hyperpigmentation that occurs on the face and neck of some women in the second or third trimester of pregnancy or while taking oral contraceptives. The areas most commonly affected are the cheeks, forehead, upper lip, and chin. Different types of melasma occur depending on the location of the excess melanin, in the epidermis or the dermis. Melasma is thought to be caused by elevated levels of estrogen, progesterone, and melanocyte-stimulating hormone (a hormone that causes melanin cells to make more melanin).

Pregnancy-induced melasma usually resolves after delivery, but may return with subsequent pregnancies or with oral contraceptives. Treatment of melasma depends on the type and involves skin-lightening agents and sometimes tretinoin (Retin-A). The proper use of sunscreen is also important because UV light can worsen melasma.

Pronunciation: muh-LAZ-muh • (noun)

Also Known As: Mask of pregnancy, chloasma

Related Resources:

Pregnancy Skin Changes
Links to information about the skin changes that are caused by pregnancy.

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