I believe you apply that to the eye related material zones. I don't apply skin textures in the material room usually. All the ones I download seem to have Mat Pose files to apply from the library pose folder.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi