When a sprain is accidentally sustained, Yunnan Baiyao aerosol should be applied immediately, which is more effective than safflower oil. This is because after a sprain, the soft tissue is severely damaged and the injury is bleeding and exuding. Using Yunnan Baiyao aerosol not only reduces swelling and pain, but also cools down the soft tissue at the injury, using the cold factor to make the blood vessels at the injury constrict and stop the bleeding, pain and swelling. If you choose to apply safflower oil to the affected area, if the gentle technique can also have a certain effect of activating blood and swelling, but if the technique is not correct, it is easy to aggravate the soft tissue damage, bleeding, swelling at the sprain, resulting in longer healing time, bringing unnecessary pain. When the sprain is three days later, the swelling begins to gradually subside, then the effect of safflower oil is better than Yunnan Baiyao aerosol, the swelling subsides to prove that the wound at the injury has healed, you can rub gently and gently to promote blood circulation, accelerate the absorption of swelling, while the cooling effect of Yunnan Baiyao aerosol will have the opposite effect at this time.