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Restylane is a gel that is injected into the skin in order to add volume. It lifts up wrinkles and can add fullness to the lips. Restylane is a volume replacement filler that is very similar to a naturally occurring substance in the body and is used to replace lost skin tissue. Restylane's technical name is hyaluronic acid. This is a natural substance that is found throughout the body. It gives, for example, volume to the skin, lubricates the joints and gives the eye its shape.Lip Enhancement