1. Pre-operative area preparation: Take a shower every day before surgery to wash away dirt and reduce the amount of bacteria in the scar area, shave off hair in and around the area, such as armpit hair, beard and hair, etc. Take care that the skin in the operative area is intact and free of boils and swellings. Avoid eating hot pot and other blood-activating diet before surgery. Chinese Academy of Medical Sciences Plastic Surgery Hospital Plastic Surgery Department Zong Xianlei 2, postoperative precautions: pay attention to the drainage fluid situation and the degree of pain, timely reflection of the condition, the face and neck pay attention to warm liquid food, limb surgery follow medical advice brake, keep the mood stable, reduce the rise in blood pressure and bleeding, follow medical advice application of drugs. 3, dilator water injection period precautions: (1) avoid excessive activity; (2) pay attention to keep the operating area clean; (3) avoid mosquito bites; (4) avoid collision, prolonged compression; (5) avoid smoking and alcohol, which can lead to vasoconstriction and skin flap necrosis; (6) pay attention to the skin scalding when bathing, to avoid freezing skin; (7) clothing immediately adjacent to the dilator, please use cotton or silk clothing to avoid allergies; (8) Avoid forcing the doctor to inject more water, frequent water injection, will lead to skin necrosis; (9) Problems promptly to seek medical treatment. 4.Dilator skin raising: After the expansion of water injection is completed, water injection needs to be stopped and maintained for 3-4 weeks, which helps to reduce skin retraction, large amount of skin out, stable flap, reduce the chance of flap necrosis, reduce incision tension and narrower incision, which helps to reduce scar growth. 5, after dilator removal: same as general surgery.