Facial fat grafting is a delicate operation in which survival and facial shape change greatly depending on where the fat is injected, how much, and at what depth. Injecting a lot at once does not produce a better result.
1–2. What is facial fat grafting, and what is the goal?
It is performed on the forehead, temples, above and below the eyes, the anterior malar area and cheeks, and around the nasolabial folds. The goal is not to plump the face but to reduce the difference in height between hollow areas and the surrounding tissue.
3–4. Why facial fat grafting is difficult
Harvested fat cells are not directly connected to blood vessels in their new location; at first they survive on oxygen and nutrients diffusing from the surrounding tissue, and they settle stably once new vessels form. Not every cell survives this process.
5. Does injecting more leave more behind?
No. Putting a lot of fat in one place makes it hard for the cells in the center to receive nutrients, which can actually lower survival — and it can make the face unnaturally large.
6–7. Why a moderate amount is spread across several layers
Injecting small amounts evenly across several layers and directions makes it easier for the fat cells to receive nutrients and reduces lumping and unevenness.
8–9. If there is not enough fat, is a second session better?
Rather than injecting a lot at the start, a staged approach — topping up only the areas that fall short after the fat has settled stably — can be safer.
10–12. Survival rate and duration
Survival varies with the area, the technique and the patient's constitution, so it cannot be pinned to a single number. Fat that has settled stably can last a long time (five to ten years or more), but it remains subject to weight changes and natural aging.
13. Scars and recovery from fat grafting
No long incision line is left, but small scars may remain at the donor site (abdomen or thighs).
The essence of facial fat grafting is not injecting a lot but helping it survive well.