Sculptra® Aesthetic can be used to fill a face that is lacking volume. Unfortunately it usually takes about three or four injections over six to twelve weeks to achieve the result that has been proven to 'stick around' for up to three years. The best thing about Sculptra® Aesthetic is that it is 'off the shelf' and can be injected when prepared the day before with just an anesthetic cream and ice. The results are gradual and may take up to a month to see. Since the volume is caused by the body reacting to it, everybody gets different volumes per injection. While this is true for fat also because of it's varied take, the desired result can be seen (with a bit extra to allow for some loss) the next day. It is a surgical procedure however and if you have more money than time Sculptra® Aesthetic will be a good option. Oh by the way, did I mention that with your own fat cells there are stem cells that can improve the quality of your skin especially in sun damaged or acne scarred skin.
The fat is permanent once the initial three weeks are up. It is living tissue taken from areas that are programmed to grow (abdomen, hips, and thighs). There may be some gradual volume loss from the face as your natural facial fat disappears however.
More immediate 'off the shelf' options are the Hyaluronic Acids, my favorite Juvederm and a recent exciting entry Hydrelle. You see immediate (24 hour results) improvement that stays about one year and probably never returns to the original.