Sorting out a slow-spreading rash

THE patient complained of a rash slowly spreading across one side of his face for nine months. You can just make out an edge across the mid cheek.

Any history of a slowly spreading scaly rash suggests a fungal infection but a more florid rash than this is usually seen, unless the patient has been applying topical steroids which suppress the scaling and redness. He denied using any topical steroid but he had been applying benzyl benzoate. I had always considered this a topical scabies agent but in fact it has antifungal properties as well. Here it was