yes its a pinworm if it was pearly white and you found in in your buttox.
I would suggest talking to your doctor about this white worm you found... in your BM.... or if you are sure it is a worm you can go to an over the counter medication.... Pin-x is the most used medication if your worm is a pinworm.....
Well BM means bal movement....it is when you go to the bathroom and take a poop.....
I think i may know what your talking about, from personal experience, but i don't quite understand what you mean by BM if you send me a response clariflying what you mean i'm sure i can help you out.