Derm — Psoriasis Guttate Drop-Like Lesions

A 14-year-old boy presents with sudden onset of multiple small, drop-shaped erythematous papules scattered over his trunk and extremities for 2 weeks. He reports a sore throat 3 weeks ago that resolved spontaneously. On examination, the lesions are <1 cm, with fine scale, and distributed widely across the trunk and limbs. The factor marked **D** in the diagram is suspected as the trigger for this presentation. Which of the following is the most appropriate initial management for this patient?