Hello 1, preoperative local examination confirmed that there was no skin inflammation in the breast; 2. General physical examination before operation, such as blood routine and cardiac and renal function examination; 3. Stop using anticoagulants such as birth control pills, vitamin E drugs or aspirin painkillers three weeks before operation to prevent wound healing and increase intraoperative bleeding. 4. Quit smoking for one week before the operation. 5. Stop taking supplements and drinking alcohol within 24 hours before the operation.