Restylane is an FDA approved dermal filler that replaces lost volume of moderate to severe facial wrinkles and folds (nasolabial folds), lasting approximately 6 to 12 months. Restylane is composed of crystal-clear, biodegradable NASHA (Non-Animal Stabilized Hyaluronic Acid) gel. Hyaluronic acid is a natural substance that exists in the body, and its most important function is to carry and bind water. NASHA does not contain animal protein and does not require a skin test. Restylane produces results that are instantaneous, lasting from 6 to 12 months, and both are gentle and safe to the skin.After treatment you may experience redness and/or swelling. This normally lasts less than seven days. Excessive sun exposure and/or cold outdoor activities should be avoided until redness or swelling disappear.