There is no fixed time to use iodophor as the wound can be left with the red solution residue after using red solution. Before using povidone iodine, you need to use saline to wash the wound thoroughly, remove the red water components, and then use povidone iodine. The composition of red potion is 2% red mercury, alcohol or water, and the main component of povidone iodine is iodine, and if it comes into contact with povidone iodine, it can form mercuric diiodide, which is highly toxic, and can cause severe irritation or even poisoning of the patient’s wound area. At present, because of the weak disinfecting effect of red potion and contains mercury, so less use, it is recommended to use iodophor to disinfect. If you have already used red potion, it is recommended to use saline to wash the wound, thoroughly remove the red potion components, and then use iodine povine to disinfect. Patients with skin injuries are advised to go to the hospital for treatment by a professional doctor to avoid complications such as infection at the wound.