Low platelet bruises may be caused by idiopathic thrombocytopenic purpura, aplastic anemia, hypersplenism, leukemia, etc. Special treatments such as medication, surgery and radiotherapy may be given according to the cause of the disease. 1. Idiopathic thrombocytopenic purpura: it is an autoimmune bleeding disorder, manifested as limbs and trunk, skin bruises and bruises, if the bruises and bleeding symptoms are serious, it can be prescribed to receive glucocorticoid medication, such as prednisone, and splenectomy can be performed for those who have ineffective hormone therapy. 2. Aplastic anemia: is due to a variety of reasons caused by the bone marrow hematopoietic hypoplasia caused by blood diseases, mainly manifested in the skin and mucous membrane bleeding, the body can appear purple and blue, the treatment can use androgens, such as stanozolol, as well as cyclosporine combination therapy. 3. Hypersplenism: hypersplenism will lead to generalized hematopoiesis, thrombocytopenia will lead to bleeding tendency, manifested as subcutaneous bruises, bruises, bleeding gums, etc., the main treatment is splenectomy. 4. leukemia: this is a hematopoietic system of malignant neoplastic diseases, patients may have bleeding, common skin bruises, nosebleeds, excessive menstruation and other symptoms, can be taken to radiotherapy, chemotherapy (cytarabine, Zoerythromycin) and hematopoietic stem cell transplantation. Therefore, thrombocytopenic patients with bruises on the body, it is recommended to go to the hospital combined with relevant examinations to clarify the diagnosis, according to different causes under the guidance of the doctor to choose different treatments.