Summary of case history,　The patient Chen,a 30 years old female. She visited the doctor because of "the recurrence of aggravation for a week after incision and drainage of left breast abscess". The left breast was red, swollen and painful, and there was yellow secretions flowing out from the incision and drainage. Now, in order to seek traditional Chinese medicine treatment, she came to Traditional Chinese Medicine Hospital in Shiyan. TCM Syndrome: Breast examination showed that there were lumps in the upper outer quadrant of the left breast, which were red and swollen. There were two incisions on the upper and lower sides of the left breast,with yellow secretions was flowing out. There was no obvious uncomfort of the right breast and armpits. The patient's menstrual cycle is usually delayed, and the last menstrual period was on February 10. The quantity, color, and quality were all acceptable,There was no other special discomfort. Other diagnosis information:general spirit, slightly red complexion, fat body, clear voice, well-proportioned breathing, no abnormal smell,red tongue, thin yellow coating, rapid pulse.,TCM diagnosis,　Acute mastitis (Liver Meridian Heat and Toxin Congestion),Western medicine diagnosis,　Plasma cell mastitis,Therapeutic methods,　The internal and external combination of traditional Chinese medicine for treatment of Plasma cell mastitis is based on the method of clearing away heat and detoxification, dredging the collaterals and reducing swelling.,Clinical outcomes,　improved