Warning - I have recently began using ACV for just about everything from cleaning the house to hygene/health. A few weeks ago I got a blister from trying to pull start a leaf blower. The skin was already gone from the blister/burn. I think I waited a day or two and it started healing somewhat on its own. I then applied ACV full strength (grocery store brand) to the burn a few times. I quit cause it seemed to make it worse. Maybe my result would have been better had I don't it immediatly or there was a no no with the exposed skin. Who knows so I probably won't try it for that again but just about anything else it has worked amazingly.