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 |