The wound is almost healed generally can use medical hydrogen peroxide. Medical hydrogen peroxide is a strong oxidizing agent, mainly killing intestinal pathogenic bacteria, Clostridium perfringens, tetanus bacillus, Clostridium botulinum and other anaerobic bacteria, but also kill pathogenic yeasts, purulent coccus, etc. It is commonly used for disinfection of skin wounds. It is commonly used for disinfection of skin wounds, and its decomposition products are water and oxygen, without secondary pollution, but high concentration of hydrogen peroxide will still burn the skin or damage the skin barrier due to its strong oxidizing property. Depending on the depth, size, location and time of the wound, different disinfection and treatment methods are usually chosen. If the wound is almost healed, it can still be properly disinfected with hydrogen peroxide, rinsed with sterile saline and air-dried until the wound is completely healed. Hydrogen peroxide can be decomposed at room temperature, after opening the bottle is valid for about 30 days, if it is not sealed, it can lose its disinfecting effect within one day, and it should be kept at low temperature and away from light for home use. If the wound appears pain, redness, swelling, fluid, etc., must promptly go to the regular hospital.