noun
exfoliation
eks-foh-lee-AY-shun/eksˌfəʊliˈeɪʃn/
The removal or shedding of thin outer layers.
Gentle exfoliation removes dead skin cells from the skin's surface.

Etymology
“Off” and “leaf” underlie the image of a surface peeling away in thin, leaf-like layers. Exfoliation names that scaling or peeling process, applied here to the removal of dead skin cells.
In context
There's physical exfoliation, which uses texture or friction to mechanically remove builtup dead skin cells from the surface of the skin.
More examples
- Too much exfoliation can leave your skin red and sore.
- Exfoliation causes thin sheets of rock to peel away.
- This soft washcloth provides mild exfoliation without a scrub.
Forms
exfoliate verb — To remove or shed thin outer layers.