However random your skin’s outbursts may seem, believe it or not, they actually all happen for a reason. There are tons of explanations as to why your skin might have erupted with a familiar looking pimple or a breed you’ve never encountered before. There are actually many different types of pimple, from the modest blackhead, to the ferociously glowing, big, bright spot that you predict will unleash a gorgeously gooey surprise for you, later down the line. There are likely a handful of pimples you’re familiar with, but for the ones you’ve yet to be acquainted with, you might want to know your enemy in advance.

So I spoke with Dr. Michael Swann, board-certified dermatologist and Mohs expert, about a variety of different types of pimples and what they mean about your skin.