The following treatment can be carried out when the leg is swollen and painful after a knock: first, early braking of the injured limb can prevent further aggravation of the injury to the leg and can play a role in pain relief; second, early cold compresses can be applied to the injury with frozen mineral water or ice wrapped in a towel to the injury, which can also play an early role in pain relief and swelling; third, early Yunnan Baiyao spray for spraying, this can play a pain, swelling, hemostatic effect, Yunnan Baiyao spray can be used for 7-10 days, because in the late can play the role of blood circulation, for the recovery of the injury are very good help; fourth, physical therapy, if the leg injury, in the acute period of 3 days after the microwave physiotherapy or far-infrared physiotherapy, which can promote This can promote the recovery of the injured leg, and at the same time, you can also take oral medication to activate blood circulation and remove blood stasis, such as large seven percent capsule, Panlong seven tablets to carry out treatment.