Leukocytoclastic vasculitis

Fully developed

Moderately dense superficial and, sometimes, deep perivascular and interstitial infiltrate of neutrophils, including abundant nuclear "dust of neutrophils," and eosinophils; lymphocytes present around venules
Fibrin within walls of venules in at least the upper part of the dermis and, at times, throughout the entire dermis; sometimes, venules in septa in the subcutaneous fat affected
Extravasated erythrocytes in variable numbers, often numerous, in the upper half o the dermis especially
Edema of the papillary dermis, sometimes eventuating in subepidermal vesiculation
Spongiosis and ballooning, at times leading to intraepidermal vesiculation
Necrosis of the epidermis often
Neutrophils within the necrotic epidermis

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