The first reason is due to the abnormal function of the coagulation system of the body, mostly due to the lack of certain coagulation factors in the coagulation system of the body or the destruction of too many platelets due to splenomegaly and hypersplenism, which can lead to the abnormal coagulation of the body and cause the legs to bruise easily. The second consideration is due to the body’s immune system diseases, including allergic purpura and thrombocytopenic purpura, etc. can cause the legs are particularly easy to bruise, for the legs are particularly easy to bruise, you need to go to the hospital hematology, blood tests, blood coagulation system and blood sedimentation and other tests to clarify the disease, usually with the target to take drugs symptomatic treatment. In addition, it is necessary to avoid trauma, which can lead to local blood vessel rupture and extravasation of blood, thus aggravating the bruising.