Itchy, burning rash that recurs on the legs every winter

A man, aged 68 years, with no known history of atopy presents with a 4-month history of an itchy and burning rash on the legs that has been recurring every winter for the past 3 years. He notes that he had dry skin at baseline and did not use emollients, but he did try hydrocortisone 1% cream without improvement. Examination ...