During the first 1-2 days the swelling from juvederm is noticeable and is almost always uneven. One side always swells more than the other and it could change the next day.
Try not to look at your lips for the first 2 days and do not massage them during this time since it only aggravates the swelling. Ice and arnica are helpful. Sometimes a little touch up of juvederm is needed a week later to smooth out any irregularities.
