A hard lump around the nipple ring may be due to plasma cell mastitis, intraductal papilloma, mastitis and other causes. 1. Plasma cell mastitis: plasma cell mastitis is usually caused by abnormal secretion of estrogen level, reduced immunity, etc. It usually belongs to the chronic mastitis disease, and may cause nipple overflow, areola with hard lumps and other related symptoms due to the influence of the lesion. 2. Intraductal papilloma: Intraductal papilloma is usually caused by breast fibroma, breast hyperplasia and other diseases, usually benign tumors, the symptoms are often manifested in the nipple, colorless, yellow, red overflow, and the areola may appear lumps. 3. Mastitis: Mastitis is usually caused by bacterial infection, nipple rupture, milk stagnation, etc. When stimulated by inflammation, it may lead to dilation of the ducts under the nipple, resulting in the symptom of hard lumps around the areola. Meanwhile, breast hyperplasia and breast malignant tumor may also manifest as hard lumps around the areola, which need to be carefully identified. It is recommended that patients should go to the hospital for timely examination to determine the cause of the hard lumps around the areola, and then do the relevant treatment.