After KYBELLA® treatment, you will likely have some swelling, bruising, or numbness under your chin. Be sure to inform your healthcare professional if you develop an uneven smile, facial muscle weakness, difficulty swallowing or injection site problems such as bruising, hair loss, open sores (ulcers), and damage and tissue cell-death (necrosis) around the injection site. Call your healthcare provider if you develop open sores or drainage from the treatment area.