Hi, Typically, you don t need to seek medical attention for these injuries(no bleeding and pain), and home treatments are quite effective. In the few hours and days right after the injury, ice is probably the most important treatment, as this will help bring down the swelling. Anti inflammatory medicines which you can buy over the counter, such as ibuprofen and naproxen, will also help with the pain and swelling. With these treatments, you should expect things to start getting better soon. Applying warm salt solution may help in reducing the swelling. Just mix 1 tbsp in a cup of water and apply the solution several times a day with the help of a cotton ball. It might cause burning sensation but will heal the wound faster. As your doctor has examined and didn t find any wound on lip and gums, swelling will subsequently decrease in size. It will take 4-5 days to resolve depending on the size. No Scan is required. Do consider a positive feedback as a credit to my work. Let me know if you have any further questions.