How do people get ice pick scars?

Every now and then I see someone with indented “ice pick“or “box” acne scars, I am lucky to not have any of these. I get very little acne, but when I do I uncontrollably pick at it( I know, I know, I should stop). I do have pink faded scars above my skin, but lucky no ice pick scars.

So I was wondering, how do people get ice pick scars? Is it from extreme face picking? Prolonged acne? Genetics?

Also, how can I prevent ice pick scars?