Lip filler adds volume to the skin. Dr. Amar will inject small amounts of filler directly into the lip or lip line, which adds volume and fullness. Most lip fillers are made with hyaluronic acid (HA) and, once injected directly into the lips, increase size and volume. Hyaluronic Acid (HA) is beneficial because it not only plumps the lips but also traps water from within to deliver a healthy, natural-looking pout. This sugar derivative is produced naturally in the body to hydrate eyes, joints, and skin. The power of this compound is hard to fully grasp; it can bind to and retain water molecules equal to 1,000 times its own weight. With such moisturizing abilities, HA makes for a perfect filler: it is biologically inspired, protects tissues, and gives long-lasting results.