Uncommon Presentation of Onychomycosis Caused by Aspergillus niger in a Healthy Adult: A Case of Non-Dermatophyte Mold Infection

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Onychomycosis is a chronic fungal infection of the nails, with nondermatophyte molds (NDMs) increasingly recognized as significant causative agents.
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NDM infections often present atypically, leading to diagnostic challenges and potential misdiagnosis due to lack of common symptoms like periungual inflammation.
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A case report describes an immunocompetent man with onychomycosis caused by Aspergillus niger, presenting as brown discoloration without trauma or systemic illness.
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Diagnosis of NDM onychomycosis requires clinical suspicion and confirmatory tests, including microscopy and fungal culture, to differentiate from dermatophyte infections.
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The patient successfully treated with oral terbinafine and topical ciclopirox showed complete improvement at three months, highlighting effective management of NDM onychomycosis.

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