From Blindsided on another thread.

"do you guys get lots of ring worm?"

Well, anyone had ringworm? Raise your hand.

The key to preventing ringworm is to make sure that the mats are cleaned regularly and that students are taking care of hygeine and not recyling their training clothes before washing.

That being said, I have had ringworm twice since 1997. Caught from others. It sucks. No training for at least a week and regular Lamisil/Lotrimin Anti-fungal until it's gone.