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 with sunlight exposure. On examination, removal of scale reveals pinpoint bleeding. He denies joint pain or systemic symptoms. His family history is significant for similar skin disease in his father. What is the most likely diagnosis?