Fire boils are medically known as boils, and it is usually not a good idea to sterilize them with iodine when they are ruptured. Iodine, which is made by dissolving iodine within alcohol, has strong antiseptic properties and is usually used on skin where no breakage has occurred. Boils are mainly caused by bacterial infections such as Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus, etc. Although iodine has a certain effect on these germs, it is irritating due to its alcohol content, which will not only cause severe pain, but also cause affect the healing of the wound. So in general, iodine should not be used on boils that have broken. Boils that are broken can be sterilized with povidone-iodine, which is made by dissolving iodine in water, and also has the function of sterilization, and this medicine will not cause greater irritation to the broken area, nor will it cause severe pain in the affected area. In general, most patients do not have any abnormal reaction after using iodophor, but there are individual patients who are allergic to iodophor, which may cause skin redness, swelling, itching and other side effects, once this phenomenon occurs, it is necessary to rinse off the iodophor with water in time, and go to the hospital in time for treatment.