IS THIS MY FAULT

There's a scratch on my chest maybe two inches long, about the width of two hairs. Where'd it come from.

- I'm not in the habit of wearing medallions inside my clothing that would scratch me
- No shirt I own has buttons that would do this
- My chest generally does not itch
-- Nor do I have a scratching implement that would cause such a mark (unlike the makeshift backscratcher I put together at my last job)
--- Nor would I even use such an implement if my chest did itch; that's what fingers are for

The only thing that's even remotely abrasive and touches that part of me regularly is probably my shower-puff loofah-thing. But if that were the cause, shouldn't I be more scratched-up, everywhere? Also, this seems like the sort of thing I'd've noticed had I done it to myself in the shower.

The only thing I can conclude is that small animals are doing this to me while I sleep and then sneaking out of the house.