A 38-year-old man from Delhi presents with a 6-month history of well-demarcated, erythematous plaques with silvery-white scale on his elbows, knees, and scalp. He reports that the lesions worsen in winter and improve in summer. His nails show pitting and onycholysis. He denies joint pain. On examination, positive Auspitz sign and Koebner phenomenon are noted. What is the most likely diagnosis and its clinical type?