What are the causes and symptoms of erythema nodosum?
Erythema nodosum can be caused by many important and treatable diseases. Among them are tuberculosis, several fungal lung infections, leprosy, inflammatory bowel disease, and some potentially dangerous bacterial infections. Drugs can also induce erythema nodosum. The most common are penicillin, sulfonamides, and birth control pills. Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.