Povidone-iodine is mainly used in medical treatment for sterilization and disinfection, which is suitable for skin disinfection, surgical disinfection, inflammation, and so on. 1. Skin disinfection: Povidone-iodine is commonly used for skin disinfection at a concentration of 1%, which can be directly rubbed on the disinfected area, such as the skin, mucous membranes, injection sites and other disinfection. 2. Surgical disinfection: Povidone-iodine is used to disinfect surgical hands or other parts of the skin at a concentration of 2%. 3. Inflammation: Povidone-iodine can be used for trichomonas vaginitis, mycosis vaginitis, vaginal douche usually with a concentration of 0.5% povidone-iodine, can also be used for stomatitis gargling, usually 1% concentration of medical povidone-iodine diluted twice for gargling. Povidone-iodine is a topical medication and is not allowed to be taken orally. Usually, povidone-iodine is diluted to avoid contact with gold, silver, aluminum and divalent alloys to avoid corrosion, and not to be used with antagonistic drugs such as red mercury.