Thank you for your question, Kelly!
Certified OculoPlastic surgeon who has done hundreds of under eye injections with facial filler products including Restylane and Belotero. Such hyaluronic acid (HA) facial filler products are very effective and relatively safe for correcting under eye hollowing (tear troughs). The most common side effects seen include some bruising and swelling, redness, and some tenderness in the injection area. All of these side effects typically tend to resolve rather quickly within the first week after treatment