A 25-year-old male medical student presents with a 4-week history of intensely pruritic erythematous papulopustular eruption on his upper back, shoulders, and chest that developed 2 weeks after completing a course of oral doxycycline for facial acne. On examination, he has monomorphic follicular papules and small pustules in a seborrheic distribution. The feature marked **D** in the diagram—the absence of comedones—is a key distinguishing finding. Which of the following diagnoses is most consistent with this clinical presentation and the absence of comedones?
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