Primary pulmonary histoplasmosis

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|image = Chest X-ray acute pulmonary histoplasmosis PHIL 3954.jpg

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|caption = This chest film shows diffuse pulmonary infiltration due to acute pulmonary histoplasmosis caused by H. capsulatum.

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|specialty = Infectious disease

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Primary pulmonary histoplasmosis is caused by inhalation of Histoplasma capsulatum spores, and approximately 10% of people with this acute infection develop erythema nodosum.{{cite book |author1=James, William D. |author2=Berger, Timothy G. |title=Andrews' Diseases of the Skin: clinical Dermatology |publisher=Saunders Elsevier |year=2006 |isbn=0-7216-2921-0 |display-authors=etal}}{{rp|316}}