Low platelet count and subcutaneous bleeding often indicate a serious reduction in platelet count, because when platelet count is mildly reduced and moderately reduced, it usually does not cause subcutaneous bleeding. If platelet count is severely reduced and there is subcutaneous bleeding, first of all, the patient should reduce activities and preferably rest in bed to alleviate the possibility of further bleeding, and at the same time, treatment should be given for the cause of thrombocytopenia, and if If subcutaneous bleeding is caused by immune thrombocytopenia, the preferred treatment is to take glucocorticoids, such as prednisone acetate or dexamethasone. If the subcutaneous bleeding is caused by aplastic anemia, myelodysplastic syndrome, or acute leukemia, the most effective method is platelet transfusion therapy. After platelet transfusion, the number of platelets in the patient’s peripheral blood is elevated, and the subcutaneous bleeding will be significantly improved.