Abstract
88 cases of microscopical diapedesis of the red blood cells in the superficial blood vessels of the skin were investigated clinically, histologically and immunohistologically. Polymorphonuclear vasculitis (PMNV) was found in 27 cases, 18 of which also demonstrated immunoglobulins (mostly IgM) in the vessel walls. Complement (C3) was found in 16 cases. The cases with PMNV formed a uniform group as regards preceding infections, drug consumption, clinical features, and pathological urinalysis and laboratory data. The second group consisted of 21 cases of lymphocytic perivasculitis with immunoglobulins and/or complement (LP + ig/C3). It clearly differed clinically from the former group in three respects:
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