When blackheads seemingly surface overnight, there’s a golden rule to live by: Don’t squeeze your skin. As tempting as it may be, that poking, prodding, and picking can do more harm than good, ...

To the naked eye, sebaceous filaments look like "tiny little black or tan dots," Dr. Zalka says, and they're roughly the size of a pinheads. And when a sebaceous filament has a buildup of oil inside, ...