Whiteheads: do not squeeze

"Whiteheads are the collection of sebum and keratin that plugs the opening of skin pore. They are caused because of excessive secretion of sebum oil. Their tips does not get blackened because the clogged grease is not exposed to the air and oxidation does not take place. These appear in the area where the skin is delicate and fine. They are common under the eyes, on the nose, cheekbone, temples and forehead." Link