Most aesthetic medicine is sold by the area. A syringe for the cheeks, units for the forehead, something else for the lips — each treated as a separate complaint with a separate solution. Faces do not work that way, and treating them that way is how people end up looking treated.
We assess the face as one structure, working outward from the midline. Proportion, projection, symmetry and how the light falls across it. Very often the visible problem is a plane or two away from where a patient would point: a flattened cheek deepens the fold beneath it, a chin set slightly back makes lips look overfilled when they are not, and hollow temples make a brow read heavy.
The practical consequence is that we usually use less product than patients expect. One syringe placed correctly beats three placed hopefully. We under-correct on a first visit by default and review at two weeks, because product can always be added and cannot always be taken away.