Dermal filler treatment is a cosmetic procedure that plumps up facial lines and wrinkles to make the skin look more youthful. Fillers usually consist of sterile hyaluronic acid gels made from non-animal sources. As we age, the skin's natural hyaluronic acid is lost, giving rise to the appearance of lines, wrinkles and folds. Fillers are also used for lip enhancement and for shaping facial, hand and neck contours.