There may be some side effects to lip fillers, but these are temporary and should only last a few days only - they are:
Bleeding from the injection sites, Swelling and bruising, Redness and tenderness at the site of the injection.
But a serious side effect would be:
Infection, allergic reaction, and asymmetry.
With a qualified surgeon, the side effects are limited to a min level.
If you will have any more questions please go to XXXXXXXXXXXXXXXXXXXXXXXXXX