Q. A 35-year-old man who was recently released from prison presents to the primary care clinic complaining of a severely itchy rash that began two weeks ago. He reports that the itching intensifies at night and he has never experienced a similar condition before. On physical examination, he is vitally stable with unremarkable systemic examination. The rash is located on his wrists, between his fingers, in his axillae, and around his waistline. There are numerous excoriations, erythematous vesicles, and linear burrows in the affected areas. Which of the following is the most appropriate medication for this patient's condition?