what is ring worm
Definition of Ringworm. Ringworm is a common infection of the skin and nails that is caused by fungus. The infection is called âringwormâ because it can cause an itchy, red, circular rash.Ringworm is also called âtineaâ or âdermatophytosis.â The different types of ringworm are usually named for the location of the infection on the body.efinition of Ringworm. Ringworm is a common infection of the skin and nails that is caused by fungus. The infection is called âringwormâ because it can cause an itchy, red, circular rash.