What disorder can cause a ring-shaped patch of itchy red skin?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Red, itchy, ring-shaped sores are often a sign of a skin infection called ringworm. This common condition is caused by a fungus, not worms as the name suggests. Ringworm patches usually have reddish borders but have clear, healthy-looking skin in the center. The edges may be raised and the sore may itch. In some cases, blisters can form. Ringworm usually goes away on its own in about a month, but over-the-counter anti-fungal medicine may speed up the process. See a doctor if ringworm persists, if a sore becomes swollen or oozes, or if you develop a fever.

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