We have used Lamisil (Athletes foot and fungal) It worked well. Prior to that we used Resolve/Tinea - it was ok - had to be applied 2x a day but we kept having flare ups.

Bloomin horrible things - We all ended up with them...
DS#2 ended up with one on his head that he didnt tell me about - it was quite big and he ended up with a bald patch ! aaargh

Didnt matter what I did - seemed to take ages to get rid of them - alot better once we used the Lamisil.

Goodluck !

Ringworm is awful - I feel your pain !