Histoplasmosis is a systemic infection caused by the fungus, Histoplasma capsulatum. Infection of H. capsulatum frequently occurs by inhaling the spores of the fungus, which is found in bat and bird droppings, or soil enriched with their excrement. If not detected and treated, histoplasmosis can develop late, severe complications such as mediastinal fibrosis, or even develop into a disseminated infection. However, histoplasmosis infections are often asymptomatic, making its detection more difficult. Further, only 6% of histoplasmosis cases will present with erythema nodosum, with most cases associated with female patients. This case presents a woman in her 50s with a pertinent history of fibromyalgia and hypothyroidism secondary to Hashimoto’s who initially sought medical care for painful nodules on her legs and was eventually diagnosed with histoplasmosis. This report clearly demonstrates the importance of maintaining a broad differential when working up inflammatory manifestations, such as erythema nodosum.
- Systemic lupus erythematosus
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