The oral anti-platelet drugs, such as aspirin, lead to bruising of the skin of the feet, and oral anticoagulant drugs, such as warfarin, can cause abnormal coagulation is also easy to appear; 4, liver cirrhosis and other diseases, due to abnormal coagulation factors, also easy to appear skin bruising. This situation occurs first of all, we should pay attention to rest, avoid to pay attention to avoid the skin bump, if this situation often occurs, also need to go to the hospital for further examination to clarify the diagnosis.