Bugs Under My Skin

I can feel them; burrowing, biting, eating my flesh.
The doctor said that I was imagining it. What does he know, anyway?
They're mischievous, though. I've cut myself, trying to get them out, but they always seem to move to a new place, once I've pulled the wound open.
They move quickly, too. My right arm is nearly flayed, and yet they've escaped again.
That's okay, I've got the determination to see this through.
They think they're so smart, moving to my abdomen.
There's a lot of flesh in there, but this fresh razor blade ought to make things easier!