Cold compresses are mainly applied to soft tissue injuries of the axillary skin, resulting in swelling and pain of the local limb. It can also be used after a traumatic fracture, with cold compresses can relieve the symptoms of local pain and prevent further aggravation of local swelling. Cold compresses, usually ice, can be applied externally with an ice-water mixture. With ice water mixture, usually in a plastic bag filled with ice, and then put the appropriate amount of cold water, cold water must be soaked through the ice, and then the plastic bag tied in a knot, applied to the injured area. It is recommended to put a layer of cotton cloth on the surface of the skin to prevent frostbite, and after each ice pack for 30 minutes, rest for 20 minutes, 30 minutes, and then a second ice pack. Such repeated, alternating ice packs can reduce local pain at the same time, can relieve the subcutaneous capillaries continue to bleed, thus preventing further aggravation of swelling.