The first thing to do is to determine whether there is a fracture or dislocation on the back of the foot, and then you can choose physical therapy or medication to alleviate the problem. 1. Determine whether there is a fracture or not: the soft tissue covering the dorsum of the foot is relatively thin, which may cause fracture or dislocation after trauma. It is recommended that the patient undergoes X-ray of the foot in the front and side positions to determine whether there is a fracture or dislocation. 2. Physical therapy: after it is clear that there is no fracture, most of the edema of the instep is caused by congestion and edema of the soft tissues, first of all, it is recommended that the patient should carry out the braking of the affected limbs, elevation, and icing within 72 hours, to avoid the further aggravation of edema; after the 72 hours of relief, you can choose to soak the feet, massage and other ways to alleviate the symptoms. 3. Medication: patients with obvious pain symptoms after injury can take oral ibuprofen, diclofenac sodium and other drugs to relieve pain; you can also take oral diosmin tablets, horse chestnut seed extract and other drugs to quickly reduce swelling. Yunnan Baiyao capsules, safflower oil and other drugs can also be used during the relief period after 72 hours to accelerate the subsidence of edema. The above medications need to be used under the guidance of a doctor to avoid self-medication. If the swelling of the back of the foot after the injury is not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner, to clarify the cause and then give targeted treatment.