I've had a couple of cysts on my back. One was surgically removed and left a gaping scar. The other was cut and drained like this video by a physician's assistant at my former school. That one wasn't fully gone. I popped the shit out of it several months back and it appears to be gone for good. You can hear her commenting on the smell - its no joke, the shit smells god awful. Pure bacteria ridden sebum.