The black labia majora of women have: I. It is related to the physical constitution and genetic factors. Second, it is considered to be the increase of estrogen and melanocyte secretion in the body after puberty, which causes pigmentation in the local area. Third, when the local friction at the vulva is excessive, there will be blackened labia majora. If a woman’s labia majora become black without vulvar itching and odor, you can observe temporarily, keep the local cleanliness, wear loose, cotton underwear, avoid excessive friction at the vulva, and eat more vitamin and trace element rich food to provide sufficient nutrition in the body so as not to cause nutritional deficiency and vulvar malnutrition.