The infection produces red, ring-like areas, sometimes with small blisters in the skin around the groin and over the upper, inner thighs. The condition can be quite itchy and even painful. Recurrence is common because the fungi can survive indefinitely on the skin. Even with proper treatment, a susceptible person may have repeated infections. 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.