Normally, the color of the vulva is pink before puberty. After puberty, as the ovaries begin to secrete estrogen and progesterone periodically, it causes the local color of the vulva to darken, so the color of the vulva is often darker than the normal skin color. After pregnancy, it is normal for the normal vulva color to be darker than in the non-pregnant state because of the thousandfold increase in estrogen. It is recommended that women of childbearing age, both before and after puberty, should keep their vulva locally clean. Wash your vulva with warm water once a day and be sure to change your underwear regularly in your daily life to reduce vulvar inflammation as well as vaginal inflammation and inflammation of the reproductive tract.