People used to think an actual worm present under the skin caused ringworm. We now know it's a ring-shaped lesion produced by your body's response to advancing fungi.
Ringworm lesions appear circular in shape with a raised border around the edges.
Lesions may itch intensely, especially in warm weather. Athletes participating in sports such as wrestling, football and hockey are extremely susceptible because of bodily contact. Transmission from adult animals is rare.