After pregnancy white spots on the nipple like pimples consider belonging to the cornucopia, sweat duct tumor, cornucopia and other diseases, in addition, there may be physiological factors. 1. Corns:Usually the cause of primary corns is unknown, secondary corns are related to skin trauma, blistering skin disease, drugs and other factors. It appears as yellowish-white, firm papules with smooth surface, not fused, and can appear on the nipples. 2. Sweat duct tumor: the etiology of this disease is currently unknown, may be related to developmental abnormalities, heredity, genetic defects and other factors. It is characterized by the appearance of soft papules of millet to mung bean size on the skin, which may appear on the nipple. 3. Milia: This disease is mainly caused by poor sweat discharge, sweat duct obstruction. It can occur at the nipple and manifests itself as small papules, small blisters, scaling, itching and other symptoms. In addition, because there are multiple milk ducts on the nipple, after pregnancy, some fluid secreted by the mammary gland can be discharged to the skin surface through the milk ducts, forming white particles, like acne, which is a normal physiological phenomenon and usually does not affect your health. It is recommended that patients combine their own situation, if necessary, to the regular hospital dermatology department, follow the doctor’s instructions for a clear diagnosis, targeted treatment.