Several factors can cause a sebaceous cyst to form, such as hormonal changes during puberty or skin infection and injury.

Stephanie Warkotsch popped what she thought was a hormonal pimple, but it grew back and "got bigger and bigger" across her cheek.

A sebaceous cyst is a small lump in the skin that usually ... warns that they can become infected. "They’re easily identified by the fact that they’re in the skin (i.e. the skin doesn ...