Ringworm is a contagious skin condition. I have posted a link that gives you all the facts and how to recognize it.

I had a cat, Marina Mar, who had ringworm for 3 months! If you have any other cats, please isolate the one with the ringworm, and also wear rubber gloves when treating it as it is contagious to both other pets and humans!!

http://www.astdhpphe.org/infect/ringworm.html