I know how that is, I get ringworm on my show animals every winter. Anti-fungal/jock itch spray or cream from a drug store. Both work, the spray is easier to put on. I use this once a day until I see hair growth. Also if you can get 7% iodine from your vet that works awsome. I normally only put it once every other day for 3 days because it really dries the skin out if you use it too much. I usually start with the iodine every other day for 3 days, and the jock itch spray everyday (not at the same time on the days I do the iodine, usually I will do one in the morning and one in the afternoon). Normal store bought iodine isn't powerful enough to do anything It usually takes about 2-5 weeks to see hair growth after I start treatment. Also if you get the 7% iodine, don't use it around the eyes as it can cause blindness.