As the infection becomes worse, the ring-shaped pattern and red-brown color may become more visible. If not treated, the skin can become irritated and painful. Skin blisters and cracks can become infected with bacteria and require antibiotics.
Ringworm can also spread to other parts of the body, including the feet, nails, scalp, or beard.
After treatment, the rash will go away. But ringworm can return unless you follow steps to prevent it. The tendency to get fungal skin infections or to have them return after treatment seems to run in families.