1, only redness and swelling, please use Jingwan Hong, comfrey cream. 2.For small blisters without itching and pain, use Furfurac® lotion externally 3.For stinging and itching, use zinc oxide ointment 4.For large blisters, please come to our hospital for treatment. 5.If the blister is broken, use iodine volt external application. Please rest assured that this treatment itself has a foaming effect, and the blisters that develop do not have any adverse effects on the body.