What should I do if my leg is swollen after a bump? You can apply a cold compress to the injured area, using frozen mineral water or an ice cube wrapped in a towel, and apply it to the injured area to stop the pain, bleeding and swelling. If there is still local swelling after three days, you can apply heat or microwave, physiotherapy, baking electricity, which can promote the absorption of local inflammation, local bruising absorption, also can spray Yunnan Baiyao, local blood circulation treatment, but also oral red wound medicine, Chinese medicine for local swelling treatment.