There are many reasons for the bumps in the nipples, the analysis is as follows: 1. nipple allergy, nipple allergy caused by contact with poor quality clothes and creams, there will be nipple rash, pain, swelling and itching, you need to stay away from allergic substances, and take antihistamines for treatment. 2. sebaceous cysts, nipples are not cleaned in time, sebaceous secretions gathered in the pores caused by cysts, you need to wash the breasts and nipples more. The cysts are not cleaned in time and the secretions of the sebaceous glands gather in the pores, so you need to clean your breasts and nipples more often, and for sebaceous cysts you need to have surgery to remove them. 3. There will be pain and swelling during the menstrual period, and the pain disappears after the period is over. The pain can be treated with prolotherapy pills when it is obvious, and if necessary, surgery is needed to remove the lump.