I remember once as a child I had ringworm and my mom used cider vinegar on it. It burned but it sure beat that ringworm out. We had used it on our cats and other farm animals also. When I was older I worked in animal care and a vet had me take photos of a huge ringworm on a goat and she had trouble curing it. I told her to try the cider vinegar and the goat was cured in no time, she now keeps it on hand. Vinegar is the only thing I will mop floors with now and it also takes the burn out of sunburn!