Mugwort, also known as mugwort in Chinese medicine, is a warming medicine to stop bleeding. If the sprain is just caused, it should not be applied in general. Just after the sprain, you need to use drugs to stop bleeding and blood stasis, as well as drugs to activate blood stasis and cool the blood, such as panax ginseng, cedar, angelica, ice chips, turtle worms and so on, with these effects of the drug can make the new sprain quickly stop bleeding, reduce swelling and pain. If the application of mugwort and other warm drugs at this time, for sprains is not good, easy to increase the degree of swelling, aggravating the symptoms of sprains. If the sprain is more than 2 weeks old or if the sprain is more than 1 month old and there are still painful symptoms, you can use a decoction of mugwort leaves for external washing. However, it needs to be applied together with other drugs to activate blood circulation and remove blood stasis, and the effect of using mugwort leaves for external cleansing alone is not ideal.