What is the cause of black female genital color?

Female vulva color blackening is caused by estrogen action. In estrogen action, vulva skin and mucous membrane will show the phenomenon of coloring, so the color will be darker than other skin colors. Before puberty, women do not show vulvar blackening, mainly because the ovaries do not periodically secrete estrogen and progesterone before puberty. After puberty, ovarian function begins to mature slowly, begins to periodically secrete estrogen and progesterone, and begins to show ovulation. When the secretion of estrogen, it will make the vulva skin and mucous membrane color show a deepening situation, and nipples and areola will also show a deepening of the color situation, and after pregnancy, estrogen increase will make the phenomenon of coloring more serious. Therefore, vulva skin darkening is a normal physiological phenomenon, so there is no need to be nervous, as long as daily life to keep vulva clean can be.