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Skin biopsy. Foci of vasculitis characterized by parietal fibrinoid necrosis (small arrows) and a small/medium caliber arteriole with subintimal infiltration of neutrophils and abundant eosinophils (large arrow) (Hematoxylin and eosin, scale bar 100 µm) (a). Arteritis and vasculitis in vessels of different caliber (Hematoxylin and eosin, scale bar 250 µm) (b).
