Upper Lip Fuller on One Side Than the Other After Restylane

Unevenness may be due to differential swelling. One side may have received more manipulation than the other side and has become more swollen. You should wait at least 2 weeks before doing anything drastic.
The ways to correct it are to add more to the side that has less or is smaller. Or you can take some out of the side that has more by injecting an enzyme to digest the Restylane. You should go to someone that has experience in doing this to have a successful result. Knowing aesthetics is also the key to getting a great result.

Uneven results after Restylane may be attributable to:

Pre-existing asymmetries of which you were unaware
Injection techinique
Restylane properties
Swelling

1. If you have pre-existing uneveness (and most do) , the restylane may make this more obvious. I occasionally did not notice old scars (and the patients forget about them too) unitl I have injected the lip. Scar tissue does not expand like normal tissue and it can create a tethering effect like a tight band which creates a bulge or lump on either side of the band. Like a muufin top that suddenly appears when you put on a tight pair of pants. It is difficult to compensate for a smaller lip on one side because injection of more restylane amy make it bigger but also make it appear to hang lower.
2. Injection technique: a dental block is less likely to cause swelling/bruising/bleeding in the area but some patients do not like this due to the amount of numbness in the area. Injecting local anesthetic into the lip can cause swelling which distorts the area and difficult to assess injection of the restylane. Any injection of material can cause bleeding on one side and not the other which can also distort the result. Generally these do resolve with time
3. Restylane tends to attract water and soften the immeadiatley firm result. Massaging the product after injection helps to reduce the edema (swelling from injection and disperse the material similar to flattening a ball of dough so that it is less "round.
4, Swelling after any surgical procedure can be affected by your head position as well. Elevating you head after surgery helps to minimize this. But if you slightly lean your face while sleeping to one side, you will notice more swelling on the side you leand towards. Also people tend to have more swelling in the morning than at night.
Give it about 2 weeks, if you are still concerned return to your doctor to discuss these matters!