A patient presents with a circular, itchy, inflamed skin lesion that is slightly raised; it is on his left side where his dog sleeps next to him. His dog has had some localized areas of hair loss. The patient has no systemic symptoms. What would you expect to find in a KOH of skin scrapings?

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The case is ringworm acquired from a dog. In tissue, any of the dermatophytes would show hyphae and arthroconidia. Pityriasis versicolor would have the clusters of yeasts with short, septate, curved hyphae (spaghetti and meatballs appearance). A filariform larvae would only be characteristic of dog hookworm, which is usually acquired from walking barefoot where there are dog feces. It would not be acquired from sleeping with the dog, and would not cause hair loss in the dog. Choice D describes Candida, which does not fit the case. Choice E would describe Blastomycosis, which is highly unlikely.

A Patient Presents with a Circular, Itchy, Inflamed Skin Lesion