Which fungal infections cause erythema nodosum (EN)?

Updated: May 11, 2020
  • Author: Jeanette L Hebel, MD; Chief Editor: William D James, MD  more...
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Coccidioidomycosis (San Joaquin Valley fever) is the most common cause of erythema nodosum in the American Southwest. In approximately 4% of males and 10% of females, the primary fungal infection (which may be asymptomatic or involve symptoms of upper respiratory infection) is followed by the development of erythema nodosum. Lesions appear 3 days to 3 weeks after the end of the fever caused by the fungal infection. Histoplasmosis may cause erythema nodosum. Blastomycosis may cause erythema nodosum.

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