Swelling after hyaluronic acid filler is common, and expected, so much so that some dermatologists will prescribe a short course of oral steroids to prevent the swelling in select patients who swell easily. Hyaluronic acid is hydrophilic which means water loving, so the more water you had that day the more your lips may swell since the procedure. The good news, is that it usually goes away within a week or two. I would not worry until it's been at least two weeks, as long as the swelling is not red and painful, which could be seen with infection. To help lessen the swelling, I would prop up on extra pillows when you sleep, and I don't usually recommend heat because that dilates blood vessels, which may add more water, inflammation and swelling.
Hang in there, be patient, and good luck.
Swelling after lip injections is very common. Studies have shown that with lip injections, younger patients swell more and bruise less, while older patients swell less and bruise more.
Because swelling can be pretty severe after the injections, I typically counsel my working patients to get their injections on Fridays so that they are ready to go back to work on Monday. This allows for a solid 72 hours of healing.
Michael M. Kim, MD
Lips are notorious for swelling after procedures, trauma, etc. As long as the swelling is soft and the overlying skin has normal color, it is unlikely that there is infection. Now that several days have past since the injection, you might try applying heat to the area. My expectation is that your swelling will resolve over the next several days.