blood disorders
Protein Disorders Causing Bruising or Bleeding
Amyloidosis
 Amyloidosis causes the protein amyloid to be deposited within blood vessels in the skin and subcutaneous tissues, which may increase the fragility of the blood vessels, causing purpura, usually on the arms. When a person develops bruising around the eyes or bruising after only light stroking, doctors may suspect amyloidosis. Doctors may do a blood test to look for the amyloid substance in the blood and also examine a sample of fat from the abdominal wall or of tissue from any affected organ to confirm amyloidosis. Treatment depends on how severe amyloidosis is and what other tissues are affected. 