A young boy develops itchy, dry scaly lesions on his leg with a raised, red, outer edge.A culture of the lesion reveals the following organism in a lactophenol cotton blue stain.This organism is most likely:

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Each ringworm lesion is the result of a local inoculation of the skin with the etiologic agent.Lesions enlarge with time, usually with most inflammation occurring at the advancing edge of the lesion.Macroconidia are spindle shaped with echinulate, thick walls; measuring 12 to 25 mm by 35 to 100 mm and have 3 to 15 cells.The tapering, sometimes elongated, spiny distal ends of macroconidia are key features that distinguish this species.CDC PHIL #15472

A Young Boy Develops Itchy, Dry Scaly Lesions on His