A 32-year-old male presents with a 6-month history of intensely pruritic, scaly plaques over both knees and elbows that worsen in winter. On examination, the structure marked **A** shows well-demarcated erythematous plaques with thick silvery-white micaceous scale on the extensor surfaces. Gentle scraping of the scale reveals a candle-grease appearance (grattage sign) followed by pinpoint bleeding (Auspitz sign). He also has nail pitting on several fingernails. Family history is significant for a father with similar skin disease. What is the most likely diagnosis?
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