Ringworm is a common skin infection. It isn’t caused by a worm, but by a fungus. It is characterized by a red itchy rash that looks like a ring under your skin.

The Facts

Ringworm is a contagious condition. You can catch ringworm from another person or a pet. Ringworm spores are very hardy and can live for years on contaminated items such as combs, showers or pool surfaces.


The fungal infection known as ringworm feeds on keratin, which is found on the outer layer of skin, nails and hair. It thrives on skin that is moist and hidden from the light. Ringworm infection of the feet is known as athlete’s foot, while ringworm affecting the groin is called jock itch.

How Long Does Ringworm Last?

Ringworm usually clears up with treatment within 4 weeks. Treatment includes using over the counter antifungal creams or powders. Without treatment, ringworm disappears within several months.


If your skin does not improve within 4 weeks, call your doctor. Be sure to let your doctor know if you have any sign of a bacterial infection including swelling, pus, discharge and fever.


To help prevent ringworm, keep your skin dry and clean. Don’t share towels, sheets or clothing. Take your pet to the vet if it has patches of missing hair, because this could be a sign of a fungal infection

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