The color of nipples on both sides of normal people should be the same, even if there is a difference. Under the action of estrogen, the pigmentation of pregnant women deepens, and the color of nipples usually turns brown or dark brown. If the left and right nipples are obviously different in color, you should go to the hospital to check whether the breast tissue on the dark side has breast hyperplasia changes. Excluding diseases such as hyperplasia of mammary glands, there is no big problem.
Usually, the color of female nipples is different in different periods. For adolescent women, nipples are usually pink. However, with the excessive secretion of hormones after menstruation and pregnancy, the nipple color will turn black and the areola color will become larger. In addition, lesions can also lead to nipple blackening. For example, women will be affected by endocrine, and too much hormone secreted by hypothalamus will also cause pigmentation.