”The disease is not caused by bacterial infection, but by the accumulation and overflow of fatty material in the ducts, which causes chemical irritation and immune reaction around the ducts, resulting in a large number of plasma cell infiltrates, hence the name plasma cell mastitis. Repeated episodes and fistulas are formed after rupture, which can be followed by bacterial infections that do not heal for a long time. So it is a special kind of inflammation of the breast. Many people do not recognize this disease and mistake it for a general bacterial infection, or misdiagnose it as breast tuberculosis, or, most frighteningly, misdiagnose it as breast cancer and incorrectly cut the breast. The occurrence of pulpy breast is related to nipple dysplasia, like nipple entropion, nipple splitting, etc. The entropion nipple becomes a place to hide dirt, often with pimple-like things, and sometimes with a bad smell. Nipple deformities also inevitably cause distortion and deformation of the ducts. The ducts are then easily blocked, and the duct contents are lipidic substances that leach the duct walls causing overflow, causing chemical inflammation, and a large number of lymphocytes and plasma cells react to form small inflammatory masses. The lesions are mostly near the areola and are locally red, swollen and painful. Usually there is no fever. It can subside on its own after a few days and then reappear when the resistance is low such as strain or cold, but it is heavier than once, and the mass gradually becomes larger, red and swollen, and eventually the redness breaks down on its own forming a fistula that is difficult to heal. The lesions can also occur in multiple places, forming multiple fistulas and even interconnecting with each other, leaving the breast with a lot of holes. This is very similar to breast tuberculosis. Recurrent, long-lasting paramammary fistulas or chronic inflammatory masses. In one case, the history of the disease was 13 years. The best time to operate is during the interictal period, when the wound is healing, but some people think they can’t have surgery when they are well. Waiting until the redness and swelling and rupture again, so delayed for a long time. The lumps are usually small at the beginning of the disease, but as the disease progresses, the lumps can involve multiple quadrants and can break down on their own to form fistulae. In the prevention of granulomatous mastitis, first of all, measures should be taken to address the causes and enhance the body’s resistance to disease, such as changing the lifestyle, relaxing the pace of life, creating a pleasant psychological state; adjusting the diet, away from radiation, preventing trauma to the breast, etc.; secondly, breastfeeding women should pay attention to breast health, prevent milk stagnation, actively treat mastitis, and be alert to the occurrence of the disease when chronic inflammation is formed. For the above two diseases, are difficult in breast disease, is a benign disease, malignant behavior, for nipple inversion should be timely reset and timely removal of secretions in the milk ducts can play a preventive role.