Nipple blackening is mostly physiological or caused by personal skin quality, if previously not black, suddenly appear black may also be the breast or the body due to disease, such as Addison syndrome. 1. Nipples are mostly light pink, but some women’s nipples are black, which is mostly physiological, because the hormone level is different in everyone’s body, and women with high estrogen level may have black nipples more easily. 2. In addition, some women with dark nipples may be related to their own skin color, which may be darker on the whole body, including the nipples. 3. A very small number of women who used to have dark nipples but have recently developed dark nipples may have underlying medical conditions, such as Addison’s syndrome and other endocrine disorders. Liver and kidney failure, also often cause changes in skin color. Women in this category should pay attention to seeking medical attention for a comprehensive body checkup, including breast examination, and should also pay attention to ensuring adequate sleep and maintaining a good state of mind. In addition, nipple blackening should also be considered sun exposure, skin diseases and other factors related to the emergence of the situation, you can go to the hospital to improve adherence to the cause of clear and follow the doctor’s instructions.