In about half of cases, the exact cause of erythema nodosum is unknown. Some cases may be associated with the following:
Infections. Some of the more common ones are:
Streptococcus (most common) Cat scratch disease Chlamydia Coccidioidomycosis Hepatitis B Histoplasmosis Leptospirosis Mononucleosis (EBV) Mycobacteria Mycoplasma Psittacosis Syphilis Tuberculosis Tularemia Yersinia
Pregnancy Sensitivity to certain medications, including:
Amoxicillin and other penicillins Sulfonamides Sulfones Oral contraceptives Other antibiotics Progestin
Other associated disorders include leukemia, lymphoma, sarcoidosis, rheumatic fever, Bechet's disease, and ulcerative colitis.
What causes Erythema nodosum?
In about half of cases, the exact cause of erythema nodosum is unknown. Some cases may be associated with the following:
Infections. Some of the more common ones are:
Streptococcus (most common) Cat scratch disease Chlamydia Coccidioidomycosis Hepatitis B Histoplasmosis Leptospirosis Mononucleosis ({{ORGANIZATION}}) {{ORGANIZATION}} Syphilis Tuberculosis Tularemia Yersinia
Pregnancy Sensitivity to certain medications, including:
Amoxicillin and other penicillins {{ORGANIZATION}} Oral contraceptives Other antibiotics Progestin
Other associated disorders include leukemia, lymphoma, sarcoidosis, rheumatic fever, {{NAME}}'s disease, and ulcerative colitis.