The reason for this is that there are many reasons for the growth of small grains on the nipples, and the analysis is as follows: 1. sebaceous cysts, the sebaceous glands are secreting fat to lubricate the nipples and prevent them from drying out, if the nipples are not cleaned for a long time it will lead to secretions blocking the follicles, thus forming cysts, which need to be cleaned from time to time and the nipples, as well as surgical removal of the cysts. 2. nipple allergy, wearing poor quality underwear and body milk leads to nipple allergy, 3. It is necessary to keep the nipples clean and apply glucocorticoid ointment for treatment. 4. Nipple eczema-like cancer, cancer patients will have nipple pimples, pain and itching. , pain and itching.