Take tide detergent mix some in waater . Enough to make the water feel slick. Then soak that burn in it and will take the pain right out of it and dry out the blister. This really works. I was putting out a fire and scooped up sand and it was red hot and burned the palms of my hands just like your arm. They didn't even scar. A 96 year old woman told me to do this. It works.