The concentration of iodine inside the tincture of iodine is relatively high, around 3%, and some can reach 5%, so it is necessary to use alcohol to de-iodize the tincture of iodine after regular disinfection, because iodine is irritating, and if the tincture of iodine is not de-iodized after use, it may lead to burning sensation, pain, blisters, dermatitis, etc. If the tincture of iodine is not de-iodized for a long time, it may lead to local skin pigmentation. Tincture of iodine is generally used to disinfect the surface of intact skin. If the skin is broken and there is a wound, using tincture of iodine will produce obvious burning sensation and pain, you can use iodophor for disinfection, because iodophor is not irritating and can be used on the surface of the wound, inside, oral mucosa and other places, and there is no need to deiodinate after disinfection with iodophor, which is more convenient to apply.