[Urticarial vasculitis]

A female patient aged 39 with urticarial vasculitis is described. She has developed stubborn not itching blisters on the skin, suffered from periodic fevers, arthralgias; laboratory analyses have shown leukopenia, hypocomplementemia, immune complexes circulating in the blood and fixed in the skin vessel walls. Histologic examination has revealed leukocytoclastic vasculitis. The differential diagnosis between this condition, chronic urticaria, and lupus erythematosus is discussed.