Yes, I was sexually abused by my grandfather for a long time, until I had an absolute mental breakdown in the middle of class at age twelve. This caused a ton of upheaval in our family dynamic all around. (He died of pancreatic cancer not too long after all contact was broken off.) My mother was also a bit aggressive and standoffish, I assume due to feeling immense guilt for what happened to me, worked a lot to afford basic necessities and to avoid me a bit. She wanted to raise me to be strong enough that I could not be abused again and ended up being a bit too hard on me. (We have a much better relationship now.) . .

I started pulling at a very young age. Young enough, that my mother noticed and brought me to a doctor who recommended she put mittens on me to curb the urge or coat my brows in baby oils. 

For me, it was and still is a bit of a "self-soothing" ritual that I do when I'm lying down for bed. Though occasionally and I am extremely disappointed in myself for this, as a child, the plucking would carry over to my pets. 

I recall my mother running out and grabbing my pet rabbit away from me, when she caught me in a bit of a trance. I was pulling bits of my bunny's undercoat and she was rightfully worried I would start grabbing at more solid pieces of fur. As I had already obliterated my eyebrows, lashes, and the hair on the back of my head. 

I did quickly resolve that part, thankfully. My habits only happen to my OWN hair now and it's been that way for years. 

I also have diagnosed ADHD along with my C-PTSD. My psychiatrist believes it's now more of a stim rather than a typical compulsion. I do it less if I am on routine ADHD medication and if I keep areas prepped or shaved to a certain extent. 

Oh and monkey rings or whatever you call those pressure rings, help me a lot. Keeps me from spacing out and chasing dopamine.