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Ringworm on a cat
Ringworm is a zoonotic condition, meaning it can affect both people and animals. Ringworm is caused by a specific type of fungus and not a worm; the name stems from when doctors believed a worm was the cause of the infection. The proper name for the disease is dermatophytosis. Ringworm is difficult to diagnose in pets because it looks similar to most skin lesions. While ringworm infection in people is often characterized by a raised round or ring-like reddish brown lesion, in pets it appears as a dry, grey or pink scaly patch of skin.
Ringworm is passed when spores get onto the skin and have a chance to grow. Moist environments will help the fungus flourish and the spores can survive in the environment for a long time. Pets infected with ringworm shed spores with their falling fur. Some animals can be carriers of the disease and never show any clinical signs. Your veterinarian will likely perform some basic tests to determine if the lesions your pet has are caused by dermatophytosis. A special lamp will cause the spores of the fungus to glow when under the light. However, not all species of the fungus glow under special lighting, so your veterinarian may also recommend taking a fur sample in order to get a more precise diagnosis. In rarer cases, some lesions are so abnormal your veterinarian may need a skin biopsy to get the proper diagnosis.
The key to any treatment plan is commitment. Due to the relentless nature of ringworm, exterminating it from your pet and your pet's environment can be a challenge. Your veterinarian will help you determine the best course of action for your pet. It's important to follow all instructions and finish all medications given as the infection may still be present even if the physical signs seem to be gone.
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