I got burned with a soldering iron, and I rubbed Aloe Vera onto it, three hours later, there's a clear(ish) bubble where I got burned. What is this?
That is the normal blister that forms after a burn-- it is not a reaction to the aloe vera. Gently keep applying the aloe vera on and around the blister. Don't try to open the blister--let it break on its own-- and then keep applying the aloe vera.