This problem must be that the doctor's injection technique is not accurate and the doctor's level is not accurate. Some needles penetrated into the dermis, resulting in severe protrusion. Or the doctor did not massage and finalize the design in time after operation, which is also one of the reasons. If the injection has been going on for some time, it is that part of hyaluronic acid has entered the muscle layer, and with the movement of the frontalis muscle, hyaluronic acid will also appear uneven. The other is whether the product selection of hyaluronic acid is correct. In this case, it is suggested to find a professional doctor for face-to-face diagnosis, inject lysozyme to eliminate some convex parts, then inject a small amount of concave parts, or steam sauna and hot compress more to promote its metabolism.