In general, small meat grains on nipples may be caused by papillary hyperplasia, sebaceous cysts or folliculitis. 1. Nipple-like hyperplasia: Frequent friction and stimulation of the nipple or wearing underwear of inappropriate size often cause abnormal growths at the nipple, resulting in the growth of small meat grains on the nipple. It can usually be treated by surgery. 2. Sebaceous cysts: not paying attention to cleaning the breast in daily life, resulting in a large amount of secretion retained in the nipple for a long time will cause sebaceous cysts, manifested as nipple growth of small meatballs. 3. Folliculitis: the patient is stimulated by bacterial or viral infection of the skin, thus triggering folliculitis, which will lead to nipple granules. At the same time, it can also be caused by flat warts, lipomas, breast tumors, which need to be carefully identified. Nipple granules can also be caused by other reasons, this symptom should be timely to the hospital to identify the cause of the disease, under the guidance of the doctor to carry out the appropriate treatment.