When a patient has local edema due to trauma, it is mainly due to the breakage of capillaries or small veins under the skin, which causes bleeding and blood pooling in the local tissues, resulting in local edema. In this case, to quickly eliminate the swelling, it is recommended that the patient must apply ice packs, which are generally applied for 15-20 minutes, 5-7 times a day. It is recommended that the patient must use a towel or clothing to wrap the ice pack to avoid direct attachment to the trauma surface, resulting in frostbite of the local skin. The duration of icing should not exceed 20 minutes, and if it exceeds 20 minutes, it may also lead to frostbite of the local skin due to the long icing time. Patients are advised to apply ice within 48 hours of injury, and after 48 hours, hot compresses can be used to speed up local blood circulation, which can also effectively relieve the swelling.