Bruising after a foot sprain is a common phenomenon after a sprain and is not directly related to the degree of recovery. After a foot sprain, due to the broken capillaries under the skin of the affected area, resulting in blood infiltration into the subcutaneous and tissue interstitial space, the hemoglobin in the blood is destroyed and absorbed and gradually transformed into a blue-purple color. This process often occurs within 1 to 3 days after the sprain. The degree of recovery from a foot sprain is largely related to the extent of the sprain and the speed of the individual’s recovery. For mild sprains that do not have no structural damage present, recovery time is typically 2 to 3 weeks. Recovery can be accelerated by braking, applying cold packs for 72 hours, hot packs after 72 hours, and applying anti-inflammatory ointments containing diclofenac diethylamide, ibuprofen, and other ingredients under the direction of a physician. If the sprain is accompanied by ligament and fracture, depending on the specific circumstances, it is necessary to fix or repair the damaged part through plaster fixation or surgery, which usually takes 3~6 months of recovery time. Sprained feet often have bruises, it is difficult to judge the recovery of sprains by the degree of bruising, sprains are recommended to go to the relevant health institutions in time to seek further medical treatment, so as to avoid delays in the condition.