One month after breast surgery, there is still a hole as big as a pinhole with pus, considering that it may be a bacterial infection that has formed a sinus tract, which needs to be treated promptly. A month after breast surgery, there is still a hole as big as the eye of a needle that has not grown well and the pus inside is often due to poor healing after surgery, bacterial infection, prolonged inflammation stimulation will form a sinus tract, manifested as continuous pus. Sinus tract pus need to be timely debridement treatment, pay attention to postoperative care to keep the wound dry and clean, promote recovery, but also can take antibiotics such as penicillin, doxycycline and other drugs to control and prevent infection, the drug should be used in accordance with the doctor’s instructions, the emergence of adverse reactions to the medical treatment, drug allergy is prohibited to use. Once the abnormal situation occurs after breast surgery, patients should consult a doctor in time and follow the doctor’s instructions for treatment.