Male nipple blackening is mainly related to genetic factors, physical stimulation, melanoma and other factors. It is recommended to do the relevant examination in time, make a clear diagnosis and give the corresponding treatment. 1. Genetic factors: black male nipples may be caused by congenital heredity, generally for the darker skin, male nipple development will also be darker, which is a normal physiological phenomenon, without special treatment. 2. Physical stimulation: frequent and repeated stroking of the nipple or repeated friction of clothing will stimulate the melanin precipitation of the local skin of the nipple, thus leading to nipple blackening. You need to change your bad habits and avoid frequent friction and stimulation of the nipple. 3. Melanoma: If there is melanoma on the nipple, there will be black nipple, accompanied by lumps, skin ulceration and other symptoms, you need to timely surgical resection, postoperative with radiotherapy, chemotherapy and other ways of comprehensive treatment. Male nipple black, consider is due to a variety of causes, it is recommended to go to the hospital in time to identify the cause of the disease, symptomatic treatment, so as not to affect the health.