Dermatillomania, or compulsive skin picking, is usually caused by some sort of stress that leads to picking as an emotional outlet, the results of which bring on additional stress, which only causes more picking. It becomes a vicious cycle that's so all-encompassing that many sufferers feel trapped without a way out, all the while feeling insecure and judged by those around them. Of course, if you have the time and the financial means, seeking professional...
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Psychology