The rare bruising that occurs after lip filler is usually not caused by the injected filler. If hyaluronic acid is used as a filler, there will be no bruising since hyaluronic acid is a naturally occurring substance in the body. However, if lip filler is performed under unhygienic conditions, by unspecialists, or if there is a risk of infection, problems may occur in the lip area. In addition, although rare, side effects such as sensitivity, swelling, pain, and infection may be observed in the area where the filler is injected. It is important to follow the care recommended by the doctor after lip filler injection and to consult a doctor immediately if an unexpected situation is noticed.