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Allergic (leukocytoclastic) vasculitis and septic vasculitis have several attributes histopathologic in common, namely, signs of vasculitis, neutrophils in the dermal infiltrate, extravasated erythrocytes, and tendency to necrosis of the surface epidermis. Small-vessel vasculitis, when developed fully, differs from perivascular dermatitis by displaying fibrin in the wall of small vessels or thrombi in the lumen of […]