★★★★★
I had a severe case of ringworm in 1959 when I was in the army. They gave me big pills of potassium permanganate. In the evening I dissolved one pill in water and soaked my feet in it for about 10 minutes. I did it every day, once a day, and it took less than 2 weeks to kill the ringworm--totally healed. It has never bothered me since.