Female nipple blackness is mainly due to local skin cell aging, hormone secretion, resulting in nipple skin melanin deposition. The main causes of nipple darkening are as follows: 1, their own reasons, some women have congenital dark skin, the body’s metabolic rate is slow, can not quickly decompose the deposited melanin, easy to lead to the nipple color is darker. 2, women to sexual maturity, estrogen secretion accelerated, if there is a sexual act, the color of the nipple will gradually become darker, it is normal physiological phenomenon, do not need to be treated. 3, women in the aftermath of pregnancy Due to the change of hormone level in the body, breast sensitivity increases, there will also be darkening of nipple and areola color, which will be gradually restored after the breastfeeding period. If you want to improve the situation of nipple darkening, usually try to choose loose, comfortable underwear, avoid friction nipple, but also through cosmetic surgery to improve the situation of nipple darkening.