After obtaining a lip filler treatment, you can expect the swelling in your lips should go down within two weeks. Most patients should expect to see swelling reduce within a few days of their treatment and in many cases, swelling will be eliminated sooner than two weeks. It is important to discuss typical swelling after the procedure with your care provider to ensure you understand the potential side effects of lip fillers and have a good understanding of how long lips stay swollen after filler treatments. Once your swelling has gone down you will see the final result of your lip filler treatment.