Sebum is an oily substance that protect and hydrate the skin’s surface. It mixes with fat molecules, called lipids, to form a protective coating on the skin. The sebaceous glands produce sebum. It ...

As a beauty editor, there's one question I get asked again and again – and it's how to shrink pores and get rid of blackheads. And while the conversation around pore-size is quite nuanced (they're ...