Hyalohyphomycosis masquerading as squamous cell carcinoma.

A case of primary cutaneous hyalohyphomycosis in a healthy individual is presented. The initial clinical impression was keratoacanthoma or squamous cell carcinoma. Upon excision, the lesion proved to be an example of cutaneous hyalohyphomycosis due to an unidentified, non-pigmented fungal organism. The lesion was completely excised, and the patient was treated with saturated solution of potassium iodide. To date, there has been no evidence of recurrence. The clinical, histologic and mycologic aspects of hyalophyphomycosis are discussed.