The first thing to consider is thrombocytopenic purpura when you have a lot of bleeding spots on your body. Thrombocytopenic purpura is associated with a decrease in platelets, and a routine blood test can reveal the exact value of platelets. If the platelets are significantly reduced, you need to actively consult with the hematology department. In addition, many bleeding spots may be allergic purpura if they are located on the extremities or buttocks. Allergic purpura is a dermatological disease, simple skin type, joint type, abdominal type, renal type, etc. need active formal treatment, if there is serious kidney damage, need to go to nephrology for follow-up treatment. The main causes of allergic purpura are many, the allergenic substances are various, you can check the allergens to find, upper respiratory tract infection or urinary tract infection, etc., can also induce the production of allergic purpura, strenuous activity may aggravate the appearance of rash. It may also be pressure purpura, pressure purpura is related to local pressure, increased brittleness of venous vessels, forceful defecation or violent vomiting, loud crying, etc. Petechiae and petechiae appear on the forceful parts, showing purpura. There is another condition to exclude, such as purpuric rash caused by abnormal coagulation function.