If high platelets may also cause bruising, consider that it may be abnormal platelet function. Platelets are a component of blood, platelets are produced by the maturation of the megakaryocytes in the bone marrow, when there is a trauma on the surface of the human body platelets will quickly adhere to the trauma, aggregated to form a thrombus to promote blood coagulation and the formation of haemostatic thrombus, platelets can also play a role in promoting the role of fibrinolysis. Excessive platelets may cause bruising, when the function of platelets is not necessarily normal, when platelets function abnormally there may be bleeding of the skin and mucous membranes, there may be bruising, there may be nosebleeds or gum bleeding, and sometimes hematuria. It can be seen in primary thrombocythemia, true erythrocytosis and chronic granulocytic leukemia. It is recommended to go to the hematology department of the regular hospital in time, do the relevant examination to clarify the cause of the disease under the guidance of the physician to receive targeted treatment, do not use drugs privately, so as not to cause adverse effects.