Acne is a skin condition that shows up as different types of bumps including whiteheads, blackheads, pimples and cysts. You are always wondering how those pimples have grown onto your face or the how you got those zits on your back. The simplest scientific explanation that you could know is that your skin is covered with tiny holes called hair follicles or pores. These pores contain sebaceous glands also known as oil glands that make sebum, oil that moisten your skin and hair. Glands, most of the time, make the right amount of sebum and the pores are fine. But sometimes, a pore gets clogged up with too much sebum, dead skin cells and germs called bacteria thus causing you to have acne.