The phenomenon of darkening of the vulvar skin or mucous membrane is mostly a normal physiological phenomenon, because women’s ovaries periodically secrete estrogen and progesterone since puberty, and the color of the vulvar skin will deepen under the action of estrogen, and it will be deeper than the color of the skin in other parts of the body, so it is a normal phenomenon. Especially after pregnancy, this color deepening phenomenon will be more obvious, so it is a normal physiological phenomenon, do not need to give the corresponding treatment, as long as the daily life to strengthen the local care of the vulva can be. However, if the vulva is black like a nevus, this situation is often caused by pathological phenomena, it is recommended to go to the hospital in time for examination, and if necessary, the black tissue will be excised and sent to the pathology, and the clinical diagnosis will be based on the pathology.