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Ringworm is caused by a fungus. The disease with the misleading name (it has nothing to do with a worm) is a common infection that often causes itchy red patches on the skin. Dogs, cats, and humans can be affected by the disease, which causes hair to fall out in affected areas. It’s easily transmitted between people and pets, and if someone (or some pet) in a household has it, all should be tested and treated, if needed. Treatment ranges from oral medications to topical products and can take weeks or months to resolve.