Acne Vulgaris
My whole life I had pimples mostly around my nose and above cheeks. My pores are filled with little tiny nodules that are mostly unnoticeable but if I squeeze my skin lots of puss would come out.
Even now as I become a middle aged man I still would get pimples, and big thick ones that never rise to the surface. Just hot little painful bumps. forehead face, and shoulders.
Since I have changed my diet, almost all of that has gone away. I have no matured face pimples, no sub cutaneous growths. Knock on wood they seemed to have calmed down.
Interesting article on Acne and it's predominance in Western Civilization