The causes of bruising on the leg and pain when pressed include the following: First, it is considered to be due to local tissue damage after trauma, which causes the rupture of tiny blood vessels and blood spillage, thus causing local bruising, and local swelling and pain when pressed. For this cause of bruising and pain, more need to cooperate with rest and topical blood circulation drugs and other treatment. If necessary, it is also necessary to go to the orthopedic department of the hospital to rule out other soft tissue injuries. Secondly, it is considered to be caused by the dysfunction of the body’s immune system, which is commonly caused by allergic purpura and so on. Due to allergic purpura leads to increased permeability of blood vessels, blood spills out of the blood vessels, which in turn causes local bruising, painful pressure, etc. To treat bruises on the legs and pain when pressed, you need to go to the hematology department of the hospital for routine blood and blood sedimentation tests to clarify.