Hi, I have a similar problem. I also suffer from OCD and I have anxiety. I mostly pop/squeeze the acne on my face but also back, chest and legs. It honestly is a really hard habit to quit especially because sometimes it can be physiologically based, and in your case it might be. I still have yet to stop completely piking at my acne and it usually gets worse around my period when I tend to break out the most. I know for me once I start to pop one pimple I just keep searching for more and then I am left feeling like a guilty, swollen mess. My greatest advice would be to refrain from looking/searching for the pimples themselves (sort of like the out of sight out of mind idea). Try to keep your mind on other things and try not to touch the areas where you usually would pick.
I Hope this helps, good luck :)
Think of a pimple as a little sack that holds oil, debris, and acne bacteria. And when you puncture the pimple's outer skin, the gunk oozes out and if the bacteria contained in that gunk splatters and lands inside other pores, it can lead to more pimples. Another risk is that when you poke, pick, prick, and prod a pimple, and you can force the debris and bacteria even deeper into your skin.