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Erythema nodosum - OBGYN Associates

Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Erythema nodosum

Erythema nodosum (say "air-uh-THEE-muh noh-DOH-sum") is a condition in which red, painful bumps suddenly appear under the skin. They usually appear on the shins, but they may also appear on the ankles, calves, and face.

This condition can be caused by a number of diseases and infections, or it can be caused by medicines. Sometimes there is no obvious cause.

It often starts with flu-like symptoms, such as fever and aches. Sometimes these symptoms come before the rash.

After about 8 weeks, the bumps turn bright red or purple and then fade to yellow or green, much like bruises. The color changes in the skin may take weeks or months to return to normal.

Treatment is often not needed. But your doctor may do tests to try to find out what caused the problem.

Current as of: November 16, 2023

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.