Breast cancer surgery axillary fluid is usually absent 2 to 3 weeks after surgery, but may take longer to subside if there is localized inflammation. Subcutaneous fluid accumulation may occur when the breast cancer surgery wound is extensive, the skin takes a long time to heal, or the blood in the wound coagulates into clots, resulting in poor drainage. The subcutaneous cavity can be closed and the fluid can be drained out by taking negative pressure suction drainage under the doctor’s guidance. With the gradual recovery of the wound, the fluid will gradually subside, usually in about 2 to 3 weeks. In case of local inflammation, anti-infection treatment, such as cefdinir, levofloxacin, etc., can be carried out under the guidance of the doctor, and the wound needs to be disinfected and bandaged under pressure every day, which may prolong the time of regression. It is recommended that the patient be treated under the guidance of a doctor and never use medication without authorization.