A 38-year-old man presents with a 2-year history of well-demarcated, erythematous plaques with silvery-white scale on his elbows, knees, and scalp. He reports a family history of psoriasis in his mother. On examination, Auspitz sign and Koebner phenomenon are positive. He has no joint symptoms. His skin lesions cover approximately 8% of body surface area (BSA). He is otherwise healthy with normal renal and hepatic function. What is the most appropriate next step in management?