Dermal fillers’ side effects are mild when you have your injections performed by a skilled provider. Most filler formulations include a topical anesthetic called lidocaine, which helps minimize any discomfort. Most people report the injections are relatively painless to mildly uncomfortable. You may experience minor bruising, swelling, redness, itching, and tenderness around the injection site, but these should resolve on their own within a few days. Learn more by reading our dermal filler instructions.