In general, swelling of trauma occurs in closed trauma, such as swelling after head and limb contusion, generally the 1st day is the peak of edema, so within 24h, try to ice mainly. Ice should not be directly in contact with the skin, but wrapped in some towels and placed continuously on the swollen position, usually for 20-30 min, and can be repeated several times within 24 h. After 24 h, the main focus is on heat, you can use hot towels, hot eggs, etc. The precautions for heat and ice are the same, pay attention to its temperature, both to play the effect of heat, but also to avoid skin burns. In addition to hot and cold compresses, if the swelling is in the limbs, you can consider elevating the affected limbs to promote the swelling to subside and return flow to the heart. In addition, you can use topical or oral medications to activate blood circulation and resolve blood stasis under the guidance of a doctor, which can also play a good role in reducing swelling.