HA Filler is a procedure that processes hyaluronic acid into a gel form and injects it into areas that need volume. Depending on particle size and viscoelasticity, hyaluronic acid is excellent for natural volume enhancement in areas such as the front cheeks, side cheeks, nasolabial folds and temples, and for delicate facial contour correction of the nose, chin and forehead. Changes can be seen immediately after the procedure, and if needed, it can be adjusted with a dissolving injection, making it relatively easy to control.