Plasmacytoid mastitis, also known as plasma milk and ductal dilation, is caused by the accumulation of ductal fat and is relatively unique compared to mastitis. 1. Pathogenic features: Plasmacytoid mastitis is a special kind of mastitis, and therefore has relatively special features. The first is that it occurs in most cases during the non-lactation period, but a few can also occur during lactation. Secondly, its incidence is not particularly low and has increased significantly in recent years. Again, it usually occurs in young women, mostly in women in their thirties after breastfeeding, but also in unmarried women or middle-aged and elderly women. Lastly, it is recurrent in nature and may often recur until it is completely cured. It has various clinical manifestations, which can be manifested as nipple indentation, nipple overflow, breast lumps, redness and pain, abscess, breakage, sinus fistula and other forms. 2, treatment: in the different stages of plasmacytoid mastitis can take different treatment methods, at present I advocate conservative treatment based on Chinese medicine, with internal and external application of Chinese medicine, abscess stage with minimally invasive drainage. For example, if the lump has not collapsed at the beginning, you can apply golden ointment externally; if it has become pus, it is advisable to puncture and extract the pus under local anesthesia or make small incisions to drain it; if a fistula has formed, after the acute inflammation has been controlled, you can selectively disinfect the ulcer with iodophor, or perform wire therapy or incision therapy. The first thing you need to do is to take a look at the actual mammary gland.