Ringworm is a common fungal infection that causes a ring-like rash on the skin. It is most often found on the scalp, body, feet, or nails. Despite its name, ringworm is not caused by a worm. Ringworm is caused by a fungus infection of the skin or nails, showing up as an itchy, circular rash. Related … Continue reading Does Sunlight Kill Ringworm? The Answer May Surprise You!