A pool worker develops these painful erythematous nodules with ulceration on his fingers and then his arms. Which of the following is the most appropriate treatment?

A. Penicillin

B. Ceftriaxone

C. Minocycline

D. Trimethoprim-sulfamethoxasole

E. Cephalexin

To find out the correct answer and read the explanation, click here. 

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