A 4-month-old African-American male presents for the rash shown. The rash has been present for the past two months. The mother describes that the baby tends to be bothered by this rash and can be seen trying to rub his feet together. Which of the following tests should be performed next?

A. KOH

B. Mineral oil prep

C. Skin biopsy

D. Bacterial culture

E. Fungal culture

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