See below: A velvety, dark patch of skin can form on most areas on the body, including the: armpits. Back of the neck. Groin area (especially in skin folds and creases). Elbows. Knees. Knuckles. Belly button. Woman’s breasts (beneath). Face. Female genitalia. Less often, a patch can form on the lips, mouth, eyelids, palms of the hands, bottoms of the feet, and nipples.
Answered 12/24/2017
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