Well the point of not being able to use cones on your hair is mostly for those who aren't using detergent cleansers to wash them off. Most people are using some type of cleanser on their face, so there wouldn't be any type of buildup. And like Eilonwy said, your skin cells shed frequently, whereas we're not shedding actual layers of our hair shaft.

Cones for your skin is meant to keep the moisture in, and protect your skin from elements such as wind and cold.
~ the artist formerly known as babywavy ~

Please excuse any typos. For the time being, we are blaming it on my computer.