A trick my ex-father-in-law did when my 5 year old son laid his hand on a hot go-kart muffler: He slathered butter on the hand and stuck it in the sugar canister. The relief was immediate. It draws the heat out immediately, I guess. After the sugar fell off--a couple of hours later--we put petro carbo salve (an old Watkins or Raleigh) soothing salve on it and wrapped it with cotton gauze. Since he was so young, it healed within a week. I've burnt my thumbs & fingers just as badly and my calf muscle once and used the same remedy with the same results except the healing takes longer for adults.