<unk>  is a vascular disorder mostly affecting women. It may be aggravated by exposure to cold and occurs most often in the lower extremities.  It can also be associated with the presence of anti-cardiolipin antibodies (the Antiphospholipid syndrome).
Livedoid vasculitis
Golfer's vasculitis
Hypersensitivity vasculitis
Cutaneous small vessel vasculitis
Polyarteritis nodosa
Drug-induced lupus erythematosus
Takayasu's arteritis
Buerger's disease