<unk>  is the black discoloration of the skin of the extremities due to decreased blood supply to the afftected areas.<unk>  is a common symptom of bubonic plague.
Acral necrosis
Synovitis
Avascular necrosis
Eosinophilic fasciitis
Osteopetrosis
Dupuytrens contracture
Myositis ossificans
Morton's neuroma