Ringworm is not a worm. It is a rash caused by a fungal infection of the skin. Ringworm of the scalp (tinea capitis) is common. Less common is ringworm of the skin, feet (athlete’s foot) and nails It is infectious and is spread by direct contact with infected humans (touching heads), things they use (sharing brushes, combs and clothes) or pets. Athlete’s foot is infectious and usually caught from the wet floors of bathrooms and changing rooms at school. Pets may also have ringworm.