4cm deep wound due to the individual’s different physique, different parts of the wound, the healing time will also have some differences, from 4 days to half a month or even longer are possible, can not be generalized. Attention to wound care in life can promote recovery. Head and neck of the blood flow is relatively rich, the skin is relatively thin, the healing speed is relatively fast, usually the wound can be healed in 4-5 days, the lower abdomen is relatively good blood flow, thin skin, healing usually takes about a week, the upper abdomen is usually 7-9 days, the limbs usually take about half a month. During the recovery period, patients should not eat spicy, stimulating food, need to keep the wound dry, clean, avoiding water, and need to go to the hospital regularly for dressing change, re-examination, if the patient suffers from diabetes, need to be under the guidance of the doctor to actively control the blood glucose, so as not to affect the healing of the wound.