Lion's wrinkle is located between the eyebrows. It is an elongated furrow that makes the face look menacing and gloomy. Removal of the lion's wrinkle can be achieved with a smoothing treatment at an aesthetician's office. It involves injecting a hyaluronic acid-based product under the skin to fill the wrinkle and improve the condition of the skin. The procedure is safe, but comes with some contraindications. Who can undergo lion's wrinkle removal treatment? What are the contraindications to filler treatment?