I used to do this since I was little and for a period of time when I was younger, I think middle school or early high school I pulled out so much hair on my head that I legitimately had a bald spot
I think mine is caused by OCPD to an extent, although I don't know what else; I my eyebrows are really long and I feel the need to pick out those that are outside of a certain line
But basically if there's a stray hair that isn't like... "with its buddies" so to speak, I feel the urge to pull it out and thats why I have like half a eyeborw now
....I never did look this up before bc I remember having a habit of pulling hair from time to time and never being able to explain why and excuse it as stress related