Ringworm is an airborne spore. It's not an actual worm or anything like that, so definitely be careful. Change clothes, maybe keep an air purifier in there with him as well. When we get it at the shelter, it is hell to keep under control and treat. There was a pill that they had gotten at one point to give to the cats. Can't remember what it was, just that it was expensive. They have a spray now also that they use on the kitties to help stop the itching and treat it. Will have to check the name of it out for you.