Symptoms and signs: Plasmacytoid mastitis has an acute onset and the main symptom is a sudden detection of a breast lump with pain, which may not be accompanied by fever. The lump may be located around the areola or surrounding area and may be accompanied by enlarged axillary lymph nodes. Ultrasonography: early stage is seen as localized glandular thickening with hypoechogenicity, abscess formation is seen in the abscess stage, often multi-lumen abscesses, and ductal contents are visible in some patients. Treatment: 1, anti-inflammatory, for sensitive bacteria and anaerobic bacteria, reasonable hormone application. 2.The disease has a long course, and can be combined with Chinese and Western medicine, with better results with Chinese medicine. 3, most patients can be treated by conservative treatment, without surgery. 4, if surgery should be, as far as possible, complete removal of diseased breast tissue as far as possible to achieve a phase of suture, as far as possible to maintain, restore the normal shape of the breast, to avoid breast disfigurement.