A 24-year-old professional football player comes to the office because of a 4-day history of "itchy feet." He knows that a few other guys on the team have similar symptoms. He is very healthy and has never had similar symptoms in the past. Physical examination shows a patchy distribution of vesiculopustular lesions between the toes.
Microscopic examination of a potassium hydroxide wet mount of cutaneous scrapings shows Trichophyton rubrum. You should,
A. advise him to dry the groin area before the feet after showering
B. advise him to keep feet warm and dry and to wear nylon socks
C. prescribe a 6-8 week course of oral griseofulvin
D. prescribe a 3-day course of topical ketoconazole
E. recommend proper foot hygiene and ask him to return for reexamination in 1 week