Thanks for your question, eric0729. Swelling can be a normal part of recovery post-filler injection. Hyaluronic acid, by nature, is a "water-loving" compound, meaning it will pull water into the tissue to hydrate and plump itself. Normally swelling only lasts a few days, but some degree of swelling can remain up to 2 weeks. If you're having a complication, I always suggest going to see your injector for in-person evaluation and the formation of an action plan. This is likely something that he/she will have a protocol to help you through, whether it's measures to reduce the swelling (like icing, arnica, antihistamines, steroids, etc) or dissolving the filler if your symptoms warrant it. If you start to experience difficulty breathing or swallowing, nausea, vomiting, or fevers, that constitutes an emergency and you should seek immediate medical attention. Best of luck! Health and Happiness, Dr. Hester