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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.
What Happens. Ringworm of the skin can start as a small patch of itchy, red, or scaling skin. The rash can spread and cover a large area. Clothing that rubs the skin can irritate the rash. Sweat, heat, or moisture in the air (humidity) can make the itching and infection worse. As the infection becomes worse, the ring-shaped pattern and red-brown color may become more visible. If not treated, the skin can become irritated and painful. Skin blisters and cracks can become infected with bacteria and require antibiotics. Ringworm can also spread to other parts of the body, including the feet, nails, scalp, or beard. After treatment, the rash will go away. But ringworm can return unless you follow steps to prevent it.