Whenever you get a pimple, you probably want it to heal quickly. But sometimes, acne blemishes leave a dark mark on your skin even after the pimple is gone. This is frustrating, but not uncommon.

Blackheads are pimples that rise to the surface of the skin. When a pore gets clogged and closes up, it’s known as a whitehead. But when the top remains open, a blackhead forms. A lot of people ...

Acne affects most teens—but it shows up differently for everyone. Here's how to handle and treat them with care.