Alcohol is used to disinfect wounds from the outside in for infected wounds and from the inside out for clean wounds. The concentration of alcohol used for sterilization is about 72%. Alcohol sterilization of wounds is better suited for non-open, non-open wounds. Because of its high irritation, it can produce significant pain if used on open wounds. For open wounds, less irritating liquids such as povidone-iodine, saline, and hydrogen peroxide can be used for disinfection. Alcohol disinfection is possible by using the wound as the center of gravity with a radius of five centimeters. The order of disinfection is, if it is an infected or contaminated wound, disinfect from the outside to the inside; if it is a clean wound, disinfect from the inside to the outside. The frequency of disinfection should be two to three times. People who are allergic to alcohol should not use alcohol for disinfection.