The usage of povidone iodine for sterilization should depend on the specific situation. Povidone iodine, fully known as compound povidone iodine, has a brown appearance and is a commonly used disinfectant in medicine. Different concentrations of povidone iodine are used in different ways, so it can be flexibly applied to disinfect in different scenarios, such as traumatic injuries, oral cavity, and the four major punctures. Specific as follows. 1. The common concentration of medical povidone-iodine is 1%, which is usually used for newly occurring traumatic injuries on the body surface (e.g. foreign body cuts, abrasions, burns, etc.), generally centered on the wound, cotton swabs dipped in povidone-iodine, disinfected from the inside to the outside for 2-3 times, and after disinfection is completed, padded with sterile gauze and wrapped, and can be disinfected on average once every 2 days; in addition, patients with pus in the wound need to be disinfected from the outside to the inside. 2. For patients with oral inflammation (e.g. periodontitis, gingivitis, etc.), 1% medical iodophor can be diluted 2 times and gargle 2-3 times, and those with severe oral inflammation can take anti-inflammatory drugs and gargle every day until the inflammation subsides. 3. For patients who are going to have four major punctures (thoracic puncture, abdominal puncture, bone marrow puncture, lumbar puncture), use 1% povidone-iodine, dip a cotton swab into povidone-iodine, disinfect the marked puncture site from the inside out, disinfecting the range of 15cm, wait for the povidone-iodine to dry before disinfecting it, disinfecting it for 2-3 times. It should be noted that the iodophor should be stored at room temperature and protected from light. Common adverse reactions are rash, itching, blisters, etc. Those who are allergic to this product, patients with wounds with fresh granulation tissue, are prohibited from mixing with red mercury. It is recommended that patients with the above conditions go to a regular hospital in time, and standardize treatment under the guidance of a doctor to avoid delays.