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Impact of HA Filler Injection Procedure for Different Facial Layers
| Layer Injected | Injected Volume | Depth | Device | Outcome | Layer Elevated |
|---|---|---|---|---|---|
| Skin | Small | Very superficial | Mostly needle | Localised | 0 |
| Superficial fat | Small to medium | Superficial | Needle/cannula | Localised | 1 |
| Deep fat | Large | Deep | Needle/cannula | Diffuse | 3 |
| Supra periosteal | Large | Very deep | Mostly needle | Diffuse | 4 except temple, lateral cheek/ jawline |
