soak it in vinegar. If need be put ice cubes in the vinegar. It works and will not blister. When we were first married dh worked at a burger joint and he had to clean the fry vats at night. I went with him once and while he was cleaning it one of the employees was goofing around and bumped into him. Hoy oil all over his arm. I grabbed a towel and some vinegar and immediately started soaking his arm. the next day it was red but no blisters. And just a few years ago we were camping and our 2yo fell into a firepit....we soon realized though there were hot coals still in it. His left hand was bad. Dh ran to the campstore and got a bottle of vinegar. We put vinegar and ice in a cup and stuck his hand in. Once he calmed down he only cried if we took his hand out. In two days you couldn't even tell he had burned it. We went on to our family reunion and one of dh's cousins who is a doctor looked at it and said he was going to recommend vinegar for burns after seeing this.