The darker color of the mucous membrane of the vulvar skin is mainly due to the periodic secretion of estrogen and progesterone by the ovaries after puberty, and the phenomenon of coloration of the mucous membrane of the vulva will occur. This is a normal physiological phenomenon, mainly caused by the action of estrogen. Especially after pregnancy, the estrogen in the body increases thousands of times, which makes this coloring phenomenon more and more serious. When a woman enters menopause, her ovarian function declines and her estrogen level decreases, it is normal for the color of the vulva skin to become lighter than that of women of childbearing age. It is advisable not to try to give bleaching, reddening, etc. for this darkening of the vulva.