<unk>  is inflammation of the vessel wall which is usually due to a<unk>  reaction to a known drug, auto-antigens or infectious agents such as bacteria.
Hypersensitivity vasculitis
Livedoid vasculitis
ANCA associated vasculitis
Polyarteritis nodosa pathophysiology
Polyarteritis nodosa
Microscopic polyangiitis pathophysiology
Golfer's vasculitis
Cutaneous small vessel vasculitis