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A 52 year old female presents with flat, purple skin lesions on her lower legs that are itchy but not painful. The patient has a history of pernicious anemia and malabsorption syndromes. A biopsy of one of the lesions reveals foci of dermal collagen degeneration covered with a fibrin cap, accompanied by an infiltration of neutrophils. Red blood cells are seen to leak out from small vessels, surrounding the degenerating collagen. Palisading granulomas are noted around the degenerating collagen. What is the most likely diagnosis?
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E