Ah, such is the curse of perfectionism. I too spend hours compulsively picking and squeezing at blemishes I'm really not sure were there to begin with. Well, I suppose they are now, anyway.
Isn't it lovely when a perfectly well-meaning person shouts "What happened to your face!? You have a huge scar!" ?
In order to combat this compulsion, I would recommend replacing it with one less damaging. Cutting your nails short and avoiding the mirror helps as well.
Is this bad advice? Probably. But we do what we must.
Your case seems quite severe, so I do hope you go to a therapist about it.