2% tincture of iodine is applied directly to the affected area, and alcohol should be used to deiodize after use; it should be noted that it should not be used on broken skin and other contraindications during use. 2% tincture of iodine consists of iodine, potassium iodide, ethanol, etc. and can be used for topical disinfection of the skin. When using the drug, use a cotton swab or cotton ball dipped in a small amount of tincture of iodine can be applied directly to the affected area, the use of attention from the inside to the outside of the circle or stacked tile-like application, the use of alcohol after the use of deiodization. It should be noted that the drug is prohibited for the disinfection of broken skin, eyes, oral mucous membranes, etc.; the drug is absolutely prohibited to be taken orally; the drug is prohibited to be used by people who are allergic to the drug. If there is burning, itching, redness and swelling at the site of application, it is necessary to immediately stop the drug and wash the local drug, if the symptoms are serious, it is necessary to consult a doctor in time. 2% iodine tincture needs to be used under the guidance of a clinician.