When the foot turns purple after bruising, it is mainly considered that there is internal bleeding after trauma, at which time the bruise turns purple. The treatment for this condition is as follows: 1. It is recommended to elevate the affected limb higher than the heart, which is conducive to venous return and swelling reduction; 2. Local scalding can be performed, and usually topical herbs that activate blood circulation and remove blood stasis can be used externally, boiled and smoked before washing, for more than half an hour each time, and the effect will be more obvious twice a day; 3. Topical ointments that activate blood circulation and remove blood stasis are used topically, and oral medications that activate blood circulation and remove blood stasis are taken. With the passage of time, most patients will gradually recover after actively cooperating with the treatment.