Lip filler: how hyaluronic acid filler is injected along the upper lip border

What the numbers show

1. 11. Upper lip border · example injection area
2. 22. Example needle entry point
3. 33. Needle
4. 44. Epidermis
5. 55. Dermis
6. 66. Thin subcutaneous layer
7. 77. Lip muscle (orbicularis oris)
8. 88. Filler laid in a line
9. 99. Injection site in the thin subcutaneous layer, enlarged
10. 1010. Deeper lip tissue

In the film

1. A fine needle enters at the lip border.
2. The needle is advanced along the lip border, just beneath the surface.
3. The needle tip sits in the thin layer between the lip surface and the muscle.
4. The filler is laid in a thin line as the needle is withdrawn.