What causes black genitals?

Vulva black is mostly due to the growth of women with age, estrogen secretion in the body gradually increased, it will cause female vulva to show pigmentation, resulting in the color of the vulva brown or light brown. But female sex life is too frequent or long-term wear tight underwear, but also causes the skin of the vulva long-term friction, so that local skin shows pigmentation, causing the vulva to be black. In addition, there are also genetic factors. If female patients in addition to vulva black also accompanied by menstrual abnormalities, vulvar itching, genital vegetation, genital erosion and other performance, it is necessary to go to the hospital in time.