Yunnan Baiyao Aerosol can be used in the late stage of knee sprain to help relieve pain symptoms, but should be discontinued when related side effects occur. Yunnan Baiyao aerosol has the effect of activating blood circulation and removing blood stasis, and is suitable for the treatment of soft tissue contusion, arthritis and other aseptic inflammation. If the knee does not see obvious skin lesions, sprains in the late stage can be sprayed Yunnan Baiyao to relieve pain and other symptoms, pay attention to try not to spray popliteal fossa area. The common side effects of Yunnan Baiyao Aerosol are mainly localized skin allergies, so if significant itching or rash occurs after use, stop using it immediately and go to a dermatologist as needed.