The differences between granulomatous mastitis and plasma cell mastitis are as follows: 1, the site of occurrence: plasma cell mastitis mainly occurs around the areola; and granulomatous mastitis around the margins of the breast, that is, from the margins of the breast to extend to the nipple; 2, the pathology is different: plasma cell mastitis is dominated by large ductal lesions; while granulomatous mastitis is a lobular-centered granulomatous dominated lesions; 3, the age of onset: plasma cell mastitis will attack at any age; granulomatous mastitis generally occurs in the childbearing and lactating period, that is, the absence of childbirth and no breastfeeding, the incidence of a lower incidence, and also psychiatric use of medication caused by the lactation of milk stagnation.