[Urticarial vasculitis: apropos of 12 cases].

12 cases of urticarial vasculitis in 6 males and 6 females of average age are studied. Cutaneous lesions are accompanied with fever (3 cases), arthralgias (5 cases), renal manifestations (2 cases) and gastrointestinal pain (2 cases). The majority presented elevated VSG and increment of the alpha-2-globulin. Histopathologically, we find two different patterns: leukocytic-classic vasculitis and lymphocytic vasculitis of small vessels. Clinical characteristics give up with dapsone better than with doses of corticoids. We consider the influence of climatological agents (fundamentally solar exposition) and we compare our cases with the literature.