Is dissolving filler painful?
Haute Living describes the discomfort this way: "Similar discomfort to filler injection itself — brief stinging at injection sites, typically mild." That is the answer as the source gives it.
What the description covers
Three parts stand out in the line. The feeling is compared with the injection of filler, it is brief stinging, and it is located at the injection sites. The word "typically" in the source leaves room for a different experience.
Where to read about filler problems
The papers The Demographics of Patients With Dermal Filler Complications and Complications of Dermal Injectables, a Retrospective Study document filler complications. UCLA Health also has a page on non-invasive facial rejuvenation.
Speaking up during the visit
Say so at the time if the feeling is stronger than that description. Readers in St. Johns, Florida, who feel pain beyond what the source calls typical can tell their provider during the visit instead of afterward.