Restylane Silk has recently been approved for release in the United States and is the first and only FDA-approved product specifically designed for subtle lip enhancement and the smoothing of wrinkles and lines around the mouth in patients over 21 years of age. Restylane Silk is a clear gel formulation of hyaluronic acid — a sugar that is naturally present in your skin. Like other areas of the face, the lips and skin surrounding the mouth show signs of aging. This often results in lip thinning, lost shape and an increase in vertical lines above the lip. It is designed specifically to provide natural-looking results in these areas. That’s why it’s made of smaller, smoother particles than those used in other Restylane products.