Erythema Nodosum Symptoms

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Definition

Erythema nodosum is an inflammatory disorder that is characterized by tender, red nodules under the skin.


Causes, incidence, and risk factors

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
    • Tu...
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