”Doctor, do I have cancer?” Sister Wang asked the doctor nervously when she went to the nail breast department of Wuhan Sixth Hospital. The deputy chief physician, Li Rong, found that Wang’s left nipple was sunken and could squeeze out a beanbag-like discharge. There was a bean-sized lump on the inside of the left areola that was vaguely painful, with red skin and small orange peel-like depressions. Dr. Li reassured her, “Your disease may be chronic mastitis. The pathological puncture confirmed Dr. Li’s diagnosis that the lump was not cancer, but rather plasmacytoid mastitis. ”My child is 10 years old, how can I still have mastitis?” Sister Wang wondered. It is true that mastitis mostly occurs during breastfeeding, but what Wang has is non-lactating mastitis, also known as chronic mastitis or plasmacytoid mastitis, which is most commonly caused by nipple entrapment leading to inaccessible milk ducts and dilated milk ducts. In the past, treatment for plasmacytosis often required total mastectomy, which greatly affected the patient’s appearance. Based on years of experience, Dr. Rong Li determined a unique surgical approach for her, in which only the lesion and all inflammatory necrotic parts were removed, and nipple shaping and corresponding plastic surgery within the breast were performed, ultimately achieving the goal of radical treatment while preserving the shape of the breast as much as possible. The early stage of chronic mastitis is characterized by brownish-yellow nipple discharge or yellowish overflow, and later on there are often lumps of varying sizes near the areola, often accompanied by nipple invagination. In the late stages of the disease, abscesses are easily formed, and the pus that comes out after breaking down often contains acne-like or lipid-like material, and the wounds do not heal over time to form fistulas, which can last up to ten years, and are not easily cured without complete removal of the abscesses and subcutaneous dilated ducts. The lesion can extend from one quadrant to two or three quadrants, while the breast deformity damage becomes more and more severe. If the lesion does not heal over time or if the breast is severely deformed, the breast will eventually have to be removed. It is easy to be suspected as breast cancer because of its clinical appearance. It is also easily confused with tuberculosis because of the fistula that remains after repeated attacks.