How is it that many red spots appear on the body?

A lot of little red dot suddenly appeared on me, which is neither painful nor itchy. It may be a small bleeding spot on my skin. The bleeding point is characterized by a diameter of no more than 2 mm, no higher than skin performance, no fading when pressed, and no obvious feeling. According to your description, it wasn't allergic skin rash. A rash is characterized by appearing on the skin, fading under pressure, and itching. So it should be counted as a bleeding point. Small bleeding spots or ecchymosis on the skin usually indicate abnormal changes in hemostasis function. The hemostatic function of human body is completed by blood vessels, platelets and coagulation factors. Lesions on either side can lead to bleeding. Diseases that cause skin bleeding spots are: 1, vascular diseases: such as vitamin C deficiency (scurvy); Henoch-Schonlein purpura-allergic inflammation of capillaries, which increases the permeability of the tube wall, not only has skin bleeding spots and edema, but also involves other internal organs, resulting in abdominal pain, joint pain, hematuria and proteinuria. Some infectious diseases, such as epidemic hemorrhagic fever, septicemia, hypoxia, poisoning, etc., will also damage the capillary wall, increase its permeability, make blood cells flow out from the gap between the tube walls, and also increase the brittleness of the capillary, making it easy to rupture. All these conditions can lead to bleeding. 2, platelet abnormalities: too few platelets and decreased function can also lead to bleeding. It is found in aplastic anemia, acute leukemia, primary thrombocytopenic purpura and secondary thrombocytopenic purpura. 3. Lack of coagulation factor: When the coagulation factor is lacking, blood is not easy to coagulate and form ecchymosis after blood vessels in the skin rupture. Because most coagulation factors are synthesized in the liver and need vitamin K, it is often easy to bleed when the liver is sick or vitamin K is lacking. Other diseases, such as chronic nephritis and systemic lupus erythematosus, often have some abnormal substances that interfere with the normal coagulation process, so bleeding will also occur. If bleeding spots are found on the skin, it is suggested to check the platelet count, bleeding time and coagulation time in time to make a clear diagnosis.