Your veterinarian may discover changes in your cat's health that you have overlooked. It is always better to err on the side of caution. Because the lesions are often circular, ringworm was once thought to be caused by a worm curling up in the tissue. Ringworm has nothing to do with any type of worm. Ringworm is also known as dermatophytosis .
Ringworm is actually an infection in the dead layer of the skin, hair, and nails.
Genetic and environmental influences play an important role in feline ringworm infection. A significant amount of research remains to be done on this disorder. It appears that Persian cats are affected most frequently. In catteries, ringworm can be hard to control because of the numbers of animals involved. The fungi live in hair follicles.