http://www.purebredlabs.com/ringworm..._is_ringwo.htm
the cat i got from vet had ringworm and he lost alot of hair but it's treatable and will grow back quickly if that happens . he was left there by a breeder because she had too many cats and didn't want him anymore cause he had ringworm poor guy. at least you caught it and are taking care of it. good luck.