so is it on the skin surface or deeper? is it when you're moving or just randomly?
I've been getting a sort of sore skin around my belly button that sometimes hurts when I move. I figured it was just stretched tender skin.
I have also had some stinging a bit deeper when I move, which I assumed was tendons or even my stomach muscles separating.

My Ob said "you'll feel a hundred strange things that you've never felt before and unless you're in labour or bleeding, they're all normal!"