You can do it! In order to be healthy, we must pay attention to one sentence, life lies in maintenance, and everyone in life can't be willful! (A) abnormal structure and function of blood vessel wall
1, heritability
(1) Hereditary hemorrhagic telangiectasia.
(2) Superelasticity of skin.
Step 2 get
(1) infectivity
Hemorrhagic fever with renal syndrome, subacute infective endocarditis, septicemia.
(2) Immune factors
Allergic purpura.
(3) Chemical factors
It is found in vascular purpura caused by various drugs.