Urticarial vasculitis is characterized by chronic relapsing urticarial
lesions of the skin which are demonstrated histologically as leucocyt
oclastic vasculitis. The disease has a wide spectrum of clinical sympt
oms: especially arthritis or arthralgias are very common. Next to the
rare primary form, urticarial vasculitis is frequently associated with
various internal diseases, in particular with autoimmune diseases lik
e systemic lupus erythematosus. Low serum complement which can be meas
ured in a large subpopulation of the patients, indicates an elevated r
isk for an internal disease. Although a number of different drugs are
used to treat the disease, its therapy remains unsatisfactory.