May Be Caused by

 Common

Arteriosclerosis obliterans

Arteritis

Connective tissue disease

Ergot reaction

Hypersensitivity angiitis

Kawasaki syndrome

Leprosy

Polyarteritis nodosa

Scleroderma

Trauma

 Uncommon

Ainhum

Arterial catheterization

Autoimmune disorder

Baby mittens

Bandage

Buerger disease

Chemical injury

Disseminated intravascular coagulation

Electrical injury

Hair band

Infection

Leukemia

Macroglobulinemia

Mechanical constriction

Myelofibrosis

Osteomyelitis

Polycythemia vera

Raynaud disease

Thermal injury

Trench foot

Trophic ulcer with underlying destruction

Tumor-produced globulins

Waldenström macroglobulinemia