Blackheads and whiteheads are the most common types of comedonal acne. Find out why they develop, how they’re treated, and more.

2. Whiteheads Whiteheads, aka closed comedones, are similar to blackheads except instead of being open to the air, the pore is closed off by a layer of skin, says McMahan. How to treat them: While ...

• Dr. Sandra Lee, aka Dr. Pimple Popper, just posted a YouTube video called "Champagne Kisses, Comedone Dreams." • In it, she starts by popping blackheads—or open comedones—on a patient's ...