Ringworm typically begins as a flat scaly area on the skin, which may be red and itchy. This patch develops a slightly raised border that expands outward — forming a roughly circular ring. The contours of the ring may be quite irregular, resembling the wavy outline of a snake or a worm.
The interior of the ring may be clear, scaly or marked with a scattering of red bumps. In some people, several rings develop at the same time and may overlap.
When to see a doctor
See your doctor if you have a rash on your skin that doesn't begin to improve within two weeks. You may need prescription medication.