Ringworm — also known as dermatophytosis, dermatophyte infection, or tinea — is a fungal infection of the skin.

“Ringworm” is a misnomer, since a fungus, not a worm, causes the infection. The lesion caused by this infection resembles a worm in the shape of a ring, which is why it got its name.

Ringworm is usually specifically used to describe tinea corporis (ringworm of the body) or tinea capitis (ringworm of the scalp). It’s sometimes used to describe tinea infection in other locations, such as tinea cruris (ringworm of the groin).