Ringworm
Ringworm is a skin infection caused by a fungus, not a worm. This is the same type of fungus that causes skin, hair, and nail infections. Ringworm looks like a worm in the shape of a ring under your skin. It is usually red and itchy. The infection can either be dry and scaly or moist and crusty. Once treated, the infection goes away and your skin will usually look the way it did before.