Women’s lower body black first need to consider the normal pigmentation, while long-term local sports or friction may also cause the skin surface black. 1. pigmentation: female body if estrogen and progesterone secretion level is high or long-term in a high state, may cause the lower part of the body of the skin to appear slightly black, is the hormone elevation stimulation caused by hyperpigmentation, belong to the normal physiological phenomenon, do not need to carry out special treatment, but can not be completely recovered. 2. Long-term friction: At the same time, if women wear tight clothes for a long time or local skin friction for a long time, it will cause mild chronic wear and tear of the epidermis. Repeated abrasion and regeneration of surface cells will gradually lead to darkening of the skin surface. This phenomenon can be effectively restored by using topical exfoliating products or regular cleansing. The darkening of the lower part of the body is mostly a normal phenomenon caused by physiological factors, so there is no need to be overly nervous, and can be lightened under the guidance of a doctor by choosing the appropriate beautification program.