What does it mean if someone picks their skin?

It was mentioned in Girl Interrupted in the very beginning of the book. What does it mean?

Answer:
Usually someone with borderline personality disorder will do things that are destructive to themselves. This could be cutting, picking, scratching...
Could be just a nervous habit. Not necessarity a mental disorder. Like if you were ever too attentive to your zits back in grade school. That sort of thing.
meth user. i have seen them dig with a pocketknife.long time users have sores all over face and arms and will scratch more than a flea infested dog.

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