Petechial hemorrhage on the body means that there is bleeding on the body, that is, the blood leaks out from the blood vessels to the blood vessels, and petechial hemorrhage on the body can be seen for a variety of reasons: First, after a person is traumatized, due to the rupture of capillaries by trauma, so there is petechial hemorrhage on the body. Second, thrombocytopenia, because platelets are the blood cells responsible for hemostasis in the body, after the number of platelets is reduced, the body’s hemostatic function will decline, which also easily leads to bruising. Vitamin C deficiency, because vitamin C can increase the density of blood vessels and reduce bleeding, when vitamin C deficiency, the density of blood vessels decreased, increased permeability, also prone to bruising. Fourth, coagulation disorders, such as hemophilia A, hemophilia B, vitamin K deficiency, etc., due to coagulation disorders, also prone to bruising on the body.