The most common side effects are temporary bruising, swelling, pain, numbness, and redness at the injection site. Some patients experience hair loss, open sores, damage, and tissue cell death around the injection site. Patients can experience trouble swallowing and nerve injury in the jaw that can temporarily cause an uneven smile or facial muscle weakness. However, studies suggest trouble swallowing resolves on its own in a median of 3 days, and nerve injury in the jaw resolves in a median of 44 days. We recommend you check our post-care guidelines after getting the Kybella procedure.