Diagnosis
Clinical suspicion arises especially if the eruption is on the feet, ankle, legs, or groin. A history of topical steroid or immunosuppressive agent is noted.
Confirmation is with a skin scraping and microscopic exam with potassium hydroxide solution. Characteristic hyphae are seen running through the squamous epithelial cells. Fungal culture is not necessary, but might be considered if the patient is using a combination antifungal and topical steroid product.
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