<unk>  is skin condition that is a typical feature of<unk>  arthritis, presenting as peripheral vascular lesions that are localized purpura, cutaneous ulceration, and gangrene of the distal parts of the extremities.
Rheumatoid vasculitis
Lupus vasculitis
Livedoid vasculitis
Urticarial vasculitis
Systemic vasculitis
Takayasu's arteritis
Polyarteritis nodosa
Cryoglobulinemic vasculitis