This is actually a misnamed fungal disease that appears as circular patches of hair loss with crusting, which may not cause itching. It contaminates the environment and is highly transmissible to people. Immediate veterinary advice is essential and a tropical cream treatment is often prescribed. If not treated fur comes off and a black spot appears. It can go to humans and humans can treat is with Tree Tea Oil, but many owners make the mistake that they can use it on their cat. This leads to poisoning and death to small kittens, but with strait away treatment the cat will probably live. When a cat has Ringworm, Don't use Tree Tea Oil.