Many years back, when I was but a lad of 26 years, I spilled gasoline on my right pant-leg. It flashed and burned for less than a minute. I took the pants off , turning them inside out to kill the flame, as stop, drop, & roll wasn't cutting it. I immediately headed for the house. We lived out in the sticks outside of Spokane Wa. at the time. Our house water came from a very cold spring. At my wife's suggestion, we filled the tub half full of the icy-cold water and I climbed in. I stayed in until the pain was too much to bear. I had entered the tub minutes after the burn.
When I climbed from the tub, I was introduced to the most pain I have ever felt in my life. The meds at the hospital didn't touch it. I lived with it for many months and bear the skin damage to this day, almost thirty years later. All I have to do is lightly bump that shin against something and it blisters and creates a sore. Then it scabs over and heals. But between the time of the bump, and the formation of the scab, it is tender, new skin, and hurts (not like the original burn of course, but rather like skinning an elbow).
If you ever spill a flammable liquid on yourself or your clothing, get it off immediately, no matter where you are. Years of pain are not worth the momentary embarassment. If you have to, buy a new pair of pants and go into the dressing room. Change them. You really can't imagine how painful a nasty 2nd degree burn really is.
Seeeeeeya; Goodweed of the North