Iodine rubbing on a wound is very painful and is generally not recommended for rubbing wounds or the inside of wounds. Because iodine is a mixture of iodine and alcohol, with the concentration of iodine at 2%-5% and the concentration of alcohol at about 75%, both can cause pain at the wound. Generally iodine is used for disinfection of intact skin surfaces, such as skin disinfection before surgery, and is usually wiped twice with iodine and then deiodized with alcohol after the iodine has dried. If you want to wipe the wound you can use iodophor, because iodophor is not irritating to the wound and can be used on the wound surface, inside the wound, mouth, perineum, mucous membrane, etc.