Millions of treatments have been performed with dermal fillers in the past. Product related reactions are rare. There are some injection related reactions that may occur after any injection; they typically resolve spontaneously a few days after injection to the skin, within a week after injection into the lips. These reactions include redness, swelling, pain, itching, bruising or tenderness at the injection site. All skin injection procedures carry a small risk of infection. After lip enhancement, lips may swell for up to a week, but this typically reduces after two to three days. In case of more pronounced reactions or if they last longer than a week contact our practitioner. You should discuss side effects and post treatment reactions with our practitioner during consultation.