You are answering a USMLE-style medical question. Question: A 55-year-old man presents with a red rash over his face for the last 3 months. The patient says he moved to Nevada 6 months ago because of a new job where he works outdoors; however, he worked indoors in an office before. His vital signs include: blood pressure 100/60 mm Hg, pulse 64/min, respiratory rate 18/min. The patient’s rash is shown in the exhibit. Which of the following is the best initial step in the treatment of this patient? Options: A) Oral tetracycline B) Oral clonidine C) Topical metronidazole D) Topical benzoyl peroxide Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.