Pronounced: AIR-uh-THEE-ma no-DOSE-umEn Español (Spanish Version)
Erythema nodosum is the name given to extremely tender lumps on the legs and sometimes the arms. They are caused by inflammation of the fat beneath the skin. The bumps look like bruises. They change color in the same way, from pink to blue to brown.
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Erythema nodosum is thought to be a type of allergic reaction. It may be caused by:
- Streptococcal infections such as strep throat, tonsillitis, andrheumatic fever
- Various viral infections such as infectious mononucleosis and hepatitis B
- Bacteria, such as Tuberculosis
- Fungal lung infections such as coccidioidomycosis and histoplasmosis
- Psittacosis, which is also known as parrot fever
- Lymphogranuloma venereum, which is an uncommon sexually transmitted disease
- Inflammatory conditions
- Sulfa drugs and some other antibiotics
- Birth control pills
- Leukotriene modifiers
- Proton pump inhibitors
- Unknown causes
Last reviewedSeptember 2013by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.