The presence of umlaut on the body, showing symptoms of skin petechiae and petechiae, suggests the possibility of skin mucosal bleeding. It is commonly seen in the following cases: 1. Due to thrombocytopenia. Generally platelets below 30*10^9/L with spontaneous bleeding tendency can present with skin mucosal bleeding. Such as immune thrombocytopenia, leukemia, aplastic anemia, etc., various diseases that cause thrombocytopenia. 2. Coagulation dysfunction. Patients with abnormal coagulation function can develop skin petechiae and petechiae. For example, patients with hemophilia, severe liver disease, DIC, vitamin K1 deficiency. 3. Increased capillary fragility. Such as allergic purpura, stress purpura, etc. If the skin petechiae and petechiae increase, it is recommended to go to the hospital to improve the blood routine, liver function, coagulation function test.