We are experiencing high call volumes in response to expanded COVID vaccination scheduling. Vaccine supplies in Idaho are limited. Please do not call St. Luke’s clinics directly regarding COVID-19 vaccination. Appointments are made through myChart as vaccine is available; we are not able to accommodate walk-ins. Unless you need to call for an emergency, you are encouraged to use myChart for questions and appointments at this time. Find additional information here.
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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 forearms, thighs, and trunk.
This condition can be caused by a number of diseases and infections, or it can be caused by medicines. About half the time, 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 a few days, the bumps turn bright red or purple and then fade to yellow or green, much like bruises. They usually fade completely in a few weeks.
Treatment is often not needed. But your doctor may do tests to try to find out what caused the problem.
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