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Although the name suggests otherwise, ringworm is not caused by a worm at all-but a fungus. This highly contagious infection can lead to patchy areas of hair loss on a dog, and can spread to other animals-and to humans, too.
Ringworm Symptoms in People. The most common symptom of human ringworm is a scaly red ring on the skin that can grow as the infection spreads. If the infection spreads, the center of the red ring will appear to clear while new rings form at the edge of the original infection.