The purpose of cold compress is to relieve the pain on the one hand, and to reduce the temperature of the soft tissue surface on the other hand, so as to reduce the capillary expansion and thus the exudation, which will help to avoid the swelling of the limb. 2, hot compress: after 72 hours, the capillary bleeding in the foot has stopped, then you can give local hot compress, such as warm towel, baking lamp, microwave, etc., has the effect of accelerating local blood circulation and promoting the absorption of tissue fluid. Therefore, after 72 hours, you can give hot compresses, which are beneficial to reduce swelling.