Girls are very dark down there, mainly because of the situation after puberty, before puberty, girls vulva is pink, after puberty due to the ovary function is perfect, the secretion of estrogen and progesterone, will be in the role of estrogen, the vulvar skin and mucous membrane will appear to blacken, this is a normal physiological phenomenon, do not need to give intervention. It is recommended to keep the vulva locally clean in daily life and change sanitary napkins diligently during menstruation. If the color of vulvar skin will be darker after pregnancy, it is mainly because after pregnancy, the estrogen in the body will be increased by thousands of times than usual, so it will be manifested as the color of vulvar skin and mucous membrane will be darker, which is a normal phenomenon.