The leg has been injured before and now it is a little swollen, which may be caused by soft tissue damage and blood clots due to trauma or unhealed fractures. Commonly used treatments include general treatment, medication and other methods. 1. Swelling of the leg caused by trauma: If the skin of the leg is not broken, applying cold compresses within 72 hours of the injury can prevent the inflammation from spreading, and then applying hot compresses 72 hours after the injury can help reduce the swelling. Elevating the affected limb above the heart can promote venous return and help reduce swelling. Take non-steroidal anti-inflammatory and analgesic drugs, such as indomethacin and ibuprofen, as prescribed by the doctor, to relieve the swelling and pain in the leg. 2. Fractures not healed: cold compresses can be used within 72 hours of injury, hot compresses after 72 hours of injury, elevate the affected limb. The use of medicines to activate blood circulation and remove blood stasis, such as safflower oil, can help patients recover from leg swelling and pain. If the fracture causes dislocation, the dislocation should be reset in time, by means of closed reset, surgical incision reset and so on. You should also immobilize the fracture end to create an environment for wound recovery and help reduce swelling. 3. Thrombosis: After the leg injury, due to the rise in platelet content, it may also cause venous thrombosis of the lower extremities, resulting in swelling of the leg. Commonly used treatment techniques include medication to anticoagulate, such as taking low molecular weight heparin. Surgery can also be done to remove the thrombus, such as contact thrombolysis through venous cannula, drug thrombolysis through arterial cannula, ultrasonic thrombus ablation, etc. It cannot be ruled out that leg swelling is due to causes other than trauma, such as varicose veins. Swollen legs may also be a harbinger of kidney disease and diabetes. It is recommended that patients with swollen legs go to the hospital in time to determine the cause of the disease in order to better carry out the next step of treatment.