<unk>  (also known as chloasma faciei, or the mask of pregnancy when present in pregnant women) is a tan or dark skin discoloration.<unk>  is thought to be caused by sun exposure, genetic predisposition, hormone changes, and skin irritation. Although it can affect anyone, it is particularly common in women, especially pregnant women and those who are taking oral or patch contraceptives or hormone replacement therapy medications.
Melasma
Tar melanosis
Xanthelasma
Ichthyosis
Pomade acne
Feline acne
Melanosis
Erythrasma