After the sprain, the general tissue will appear edema and bruising, and at this time if you want to perform external ointment treatment, you should wait until 24 hours after the sprain. Because within 24 hours of the tissue sprain, edema and bruising is not stable, if coupled with the application of ointment to activate blood circulation and resolve blood stasis, it is easy to cause increased edema and bruising, which is not conducive to recovery. So the cream should wait until 24 hours after the sprain can be applied, and tissue sprain after 72 hours to the peak, that is, edema and bruising is the most serious. So 24 hours after the start of the external ointment, and to apply about 10 days, because the bruising, edema absorption takes about 10 days. In the process of 10 days, the application of ointment to activate blood circulation and remove blood stasis can promote bruising and edema to subside, thus promoting the recovery of sprained tissues.