<unk>  has no association with anti-neutrophil cytoplasmic antibodies, but about 30% of people with<unk>  have chronic hepatitis B and deposits containing HBsAg-HBsAb complexes in affected blood vessels, indicating an immune complex-mediated cause in that subset. Infection with the hepatitis C virus and HIV are occasionally discovered in people affected by<unk> .<unk>  has also been associated with underlying hairy cell leukemia. The cause remains unknown in the remaining cases; there may be causal and clinical distinctions between classic idiopathic<unk> , the cutaneous forms of<unk> , and<unk>  associated with chronic hepatitis. In children, cutaneous<unk>  is frequently associated with streptococcal infections, and positive streptococcal serology is included in the diagnostic criteria.
Polyarteritis nodosa
Lupus vasculitis
Takayasu's arteritis
Thromboangiitis obliterans
Livedoid vasculitis
Vasitis nodosa
Urticarial vasculitis
Diabetic angiopathy