There are four types of medical alcohols respectively, which have different roles and efficacy according to their concentrations: 1. The highest concentration is usually 95% alcohol, which is only used for wiping UV lamps and wiping and disinfecting the applied combined equipment. 2. The most commonly used medical alcohol is 75% degree alcohol, which is usually used for applying epidermal disinfection, because too high a degree of alcohol will form a protective film on the surface of the bacteria, preventing the killing of The bacteria are difficult to sterilize completely inside the body. If the concentration is too low, although it can enter the bacteria, it cannot completely coagulate the proteins in the body. 75% alcohol is the most commonly used alcohol for disinfection and sterilization. 3. 40%-50% alcohol can prevent bed sores, which can be caused by squeezing the back, waist and buttocks of patients who are bedridden for a long time. A small amount of 40%-50% alcohol can be poured into the patient’s hand during massage, and the patient can be massaged evenly to promote local blood circulation and prevent the formation of bedsores. 4. 25% alcohol can be used to physically reduce fever, and the patient can be rubbed when he has a high fever to achieve the role and efficacy of physical cooling.