The bruising is due to subcutaneous bleeding in the absorption process, and there are many triggers for subcutaneous bleeding. The coagulation factors in the body are produced by the liver, so it is necessary to check the liver ultrasound or CT, liver function, coagulation four, etc. to see the synthetic function of the liver. Based on the results, we can provide relevant treatment, such as liver protection and active treatment of liver diseases. Also, supplementation of relevant raw materials, such as vitamin K1, etc. 2. Platelet deficiency, often caused by excessive platelet consumption or decreased ability of bone marrow to synthesize platelets, requires abdominal CT, for example, to see if there is enlargement of the spleen, and also bone marrow aspiration smear, blood count, etc. 3. Bleeding caused by taking special drugs, such as warfarin, etc. In conclusion, if bruising persists, you need to go to the hospital promptly to clarify the cause.