A white, pimple-like discharge from the nipple is considered to be caused by inflammation in the milk ducts. If a woman is older than 35 years old and has a history of pregnancy and breastfeeding, if milk stagnates in the milk ducts during the process of returning to the breast, the milk will clot and become inflamed over time. As the milk ducts in the breast expand with age, white pimple-like material will be discharged, and in this case, attention should be paid to the cleanliness of the nipple to clean the discharge. If definitive treatment is needed, lactoscopic lavage can be performed and therapeutic medication can be injected into the milk ducts to relieve the symptoms. If the inflammation continues to irritate without treatment, swellings in the milk ducts may form.