Bruising and swelling after foot sprain is considered to be caused by soft tissue injury, fracture, etc. It can be treated with general treatment, physical therapy, medication, surgery, etc. according to the condition. 1. Soft tissue injury: after foot sprain, if there is skin and subcutaneous tissue injury, it will cause subcutaneous bleeding and tissue exudation increase, thus causing bruises and swelling. After the sprain, you should pay attention to rest, you can immediately apply cold compresses to the affected area, you can also elevate the affected limb. If the pain is severe, non-steroidal anti-inflammatory analgesic drugs, such as diclofenac sodium, can be applied to treat. Generally about one or two weeks can be recovered. 2. Fracture: more serious sprains, in the soft tissue injury, may also be accompanied by fractures, will cause bruising, swelling, pain, limited mobility and other symptoms. At this time, you need to pay attention to rest, and timely radiography to see the severity of the fracture displacement. If there is no obvious displacement, the fracture can be immobilized with a cast or brace. If the displacement is serious, surgical incision and fixation can be performed. After the foot sprain, if the bruises and swelling are serious or accompanied by impaired mobility, you should consult a doctor to determine the severity of the injury, and then take appropriate treatment measures. The above medications should be used under the guidance of a physician.