Foot sprain can be used after safflower oil, however, the use of time is generally 48 hours after the injury, because if within 48 hours, this time the sprain part of the small blood vessel rupture, blood seepage, will form a localized bruising, swelling, in the application of safflower oil massage will lead to local vasodilatation, accelerated circulation will lead to further increase in the amount of bleeding, resulting in bruising, swelling gradually aggravated, is not conducive to the It is not conducive to the recovery of the disease. The use of safflower oil after 48 hours can effectively increase local blood circulation, promote the metabolism and absorption of local inflammatory metabolites, and small blood vessel rupture bleeding has been closed, will not lead to further aggravation of hemorrhage, and can effectively relieve the local inflammatory edema as well as stasis and swelling, but also increase the supply of arterial blood to promote the recovery of the local tissues, and significantly reduce the symptoms of local pain as well as bruising and swelling.