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What is nummular dermatitis?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Nummular dermatitis is a relatively uncommon skin condition. It's also known as nummular eczema. The main symptoms of nummular dermatitis are reddish marks on the skin. These marks, or lesions, are roughly the size and shape of coins. They usually appear on the arms or legs. Nummular dermatitis causes the skin to become itchy and inflamed, too. In severe cases, the skin lesions may ooze fluid and become crusty.

Nummular dermatitis usually affects older men. No one knows the cause of this condition. If you think you may have nummular dermatitis, see a doctor. 
Nummular dermatitis, also known as nummular eczema, is a skin condition that causes coin- or oval-shaped rashes to form on the skin. The patches of rashes are usually red and itchy, and they can form almost anywhere on the body. Usually, the rashes last for a few weeks or months and then go away, but sometimes people may be affected by the rashes for years. It often begins as a result of extremely dry skin or after some kind of skin injury. In rare cases it follows exposure to mercury, or exposure to nickel, formaldehyde, or other substances for people who are allergic to them.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.