1, etiology and performance Plasmacytoid mastitis is currently inconclusive, most people believe that it is related to infection, with Staphylococcus aureus, anaerobic bacteria, Mycobacterium bovis infection, manifested as dilated milk ducts, nipple overflow or peri-mammary duct inflammation or breast swelling or advanced milk duct fistula. 2, treatment (1) acute phase of redness, swelling and heat Dexamethasone 1.5mg / time, tid + metronidazole 0.4mg / time bid + azithromycin capsules, a week later stop Metronidazole and azithromycin, dexamethasone reduce the dosage, can control inflammation, reduce the mass (2) for the formation of fistula patients, may have non-tuberculous mycobacterial infection Isoniazid 0.3g / d + rifampin 0.45g / d + Treatment for 9-12 months (3) Milk duct overflow Oral tamoxifen 10mg/time, bid, one month – three months; a. If it is nipple overflow, you can lactoscopy and flush, once a week, one 6-8 times can; b. If flushing is ineffective, you can Melanoplasty locate and then surgically remove the diseased milk duct; c. If it is a mass, you can choose surgery Remove the mass.