WebMD Answers
Ringworm is caused by a fungus that grows on the skin. Once the fungus is established, it spreads out in rings. The center of the ring may clear up, while a new ring of infection develops at the edge of the old ring.
Children are most likely to get ringworm. Ringworm of the scalp can spread from child to child when children share hats, combs, or brushes. Ringworm of the body can be spread on towels, clothing, or sports equipment. Personal hygiene is important in preventing the spread of ringworm. Dogs and cats can be infected with ringworm, too, and they can pass it to people through direct contact.
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