It's a strong disinfectant so you just use a few drops diluted with water and apply it to the spot. It will start to tingle. You should find it in a normal supermarket near the cleaning agents. Otherwise use the Carlifax which I am sure contains Jeyes Fluid (or the chemical in it) because it smells just like it. Carlifax you get at the pharmacy. The ringworm will dry up very quickly with either of these. If you use anything else, it'll take a lot longer. HTH!