Scalp ringworm is caused by Trichophyton or Microsporum, another fungus. Scalp ringworm is highly contagious, especially among children. It may produce a red scaly rash that may be somewhat itchy, or it may produce a patch of hair loss without a rash. Nail ringworm is an infection of the nail caused by Trichophyton. The fungus gets into the newly forming part of the nail, producing a thickened, lusterless, and deformed nail.
Infection is much more common on the toenails than on the fingernails.
An infected toenail may separate from the toe, crumble, or flake off. Body ringworm also results from Trichophyton. The infection generally produces a pink to red rash that sometimes forms round patches with clear areas in the centers. Body ringworm can develop anywhere on the skin. Beard ringworm is rare.