We tend to have a bit of fungus here from time to time, H had a bad one on her leg last year. Treated it by slathering on thick layer of canesten last thing at night - don't rub it in, but cover it with gladwrap or a non absorbent plastic-type dressing. In the morning take the plastic off, most of it will have absorbed over night. H's was quite bad but visibly better after a few days and gone completely in 10 days.