I have done this for years,I thought it was just me.I particularly pick in the night when I can't sleep.I have quite a bit of scaring.I had wondered if it was a mild form of self harm.I have never done anything worse.I also bite my nails which I have done all my life,although strangely I can grow my nails for special occasions like a holiday or my son's wedding last year.I did actually stop picking before my knee operation in March because I knew if I had any open wounds they would not go ahead,so I obviously can control it.I never knew it had a name.