The black color of a woman’s vulva may be related to congenital factors, development, pregnancy and improper cleansing. 1. Innate factors: the color of female vulva is related to heredity, and the vulva may be born with black color, and if the woman herself has black skin, the vulva will also have black color. 2. Development: After puberty, the estrogen secreted by the ovaries will gradually increase, and the mucous membrane of the vulva will become darker under the action of the hormone, resulting in the darkening of the vulva pigmentation. 3. Pregnancy: During pregnancy, the body secretes more progesterone, which can also lead to darkening of the vulva. 4. Some people use too strong alkaline detergent to clean the vulva for a long time, which may cause the local skin color to deepen, and some medicinal ingredients contained in some disinfectant solution may also cause hyperpigmentation in the long-term use. Women’s vulva is different, as long as it is not related to the disease, do not have to pay too much attention. If there is a sudden increase in the local black color, we should be vigilant that it is due to disease, and we recommend that you seek medical attention in a timely manner.