Why can results look different on each side of the face?
Natural asymmetry, uneven swelling, and staggered onset explain most side-to-side gaps — judged properly at about two weeks.
Faces are rarely symmetric to begin with: muscle strength, skin thickness, and bone contour differ subtly between sides. Add swelling that resolves at different speeds and botulinum toxin that can take effect a few days apart on each side, and an early left–right gap is more common than surprising.
When to wait, and when to go back in
The early weeks carry noise as much as signal: botulinum toxin needs up to two weeks to show its full effect, and filler swelling distorts contours over a similar window. Comparing photos taken in the same light and angle helps separate a real difference from day-to-day variation.
How much asymmetry shows, and how it settles, differs with individual anatomy and the procedure. If a clear gap remains once the full effect is in — around the two-week mark — a follow-up visit is the designed answer: the specialist can compare against baseline photos and fine-tune with a small touch-up where appropriate.
MediIndex articles are for general information only and are not medical advice, diagnosis, or advertising. Outcomes vary by individual — consult a board-certified specialist for personal decisions.