An Atypical Case of Exophiala Bergeri Chromoblastomycosis in an Immunosuppromised Individual.

Chromoblastomycosis (CBM) is a rare chronic, granulomatous mycosis affecting the skin and subcutaneous tissue. It is a deep, slow growing, fungal infection that most often presents with epidermal changes that clinically appear as a hypertrophic and verrucous plaque. We describe an atypical presentation of an immunocompromised male patient, age 76 years, who presented with a 4-month history of painless subcutaneous firm nodules of the left fifth finger. The fungal culture grew Exophiala bergeri, and histopathology showed medlar bodies with lack of pseuodepitheliomatous hyperplasia or epidermal changes commonly seen in CBM. To our knowledge, this is the first case of Exophiala bergeri CBM in the United States, highlighting its unique clinical presentation and expanding the differentials for a subcutaneous nodule.