Cosmetics are, in reality, skincare that "feels good on the skin", but doesn't really penetrate deep into your skin (where the change actually happens) and doesn't really offer results.
Cosmetics don't have a high formulation of active ingredients to deliver change within the skin. Instead, with a much lower percentage of active ingredients, they only sit on the surface of the skin, the stratum corneum.
They are unable to penetrate the skin through to the dermis.
Cosmetics cannot correct or change the skin or treat a severe skin condition.