Povidone-iodine expired can not be used. Povidone iodine is a topical disinfectant product, if it has expired, the ingredients inside will deteriorate, resulting in iodine sublimation and evaporation, complex iodine will be dissociated from it, and it will not play the role of sterilization and disinfection, and it may irritate the wound, affecting the normal recovery process of the wound, and it may also cause redness, swelling and pain in the skin, itching and other phenomena, so expired povidone iodine can not be used. Skin wounds need to be disinfected, you need to buy, in the expiration date of the povidone-iodine for use, can not use the expired product. If the use of povidone-iodine irritates the skin and causes uncomfortable symptoms, you need to go to the regular hospital for examination and take appropriate treatment measures as prescribed by the doctor.