Cutaneous Coccidioidomycosis and Basal Cell Carcinoma: Case Report on a Diagnostic Dilemma

In the world of medical diagnoses, a particularly intriguing scenario unfolds, wherein the cutaneous manifestation of a systemic fungal infection disguises itself as a Basal Cell Carcinoma (BCC), a skin cancer. Coccidioidomycosis is an endemic fungal infection caused by inhaling spores of the fungus Coccidioides immitis. It is primarily a pneumonic illness which, in a few cases, has the potential to cause severe systemic disease. In this article, we report a case of a 60-year-old female with a known history of infiltrating ductal carcinoma of left breast status post lumpectomy and adjunct chemotherapy presented with complaints of cough, fever, and easy fatigability that seemed to be attributable to her immunocompromised state. She also had a pseudo-vesicular plaque on her left upper arm for two years. As we delve into the case, it becomes clear that Coccidioidomycosis and other opportunistic infections are commonplace among immunocompromised patients. Prior awareness of this condition and a cautious yet open-minded approach prevented gross misdiagnosis in our case. Physicians should be vigilant in diagnosing Coccidioidomycosis, especially in immunocompromised patients presenting with mild constitutional symptoms in endemic regions. Early detection and management are crucial to prevent severe complications and increase patient survival rates.