Ah, thanks for the suggestions! They helped me calm down a bit as I tend to go into freak out mode any time something seems wrong.
He's healed up a little bit, I've been taking him out daily to make sure the wound hasn't gotten infected and have been keeping him on paper towel sheets rather than loose aspen bedding.
And no, I don't have any tape in the enclosure, and haven't found any sharp edges, yet. Still baffled on what happened to cause this. It honestly looks like the scale got ripped off to me, but I can't seem to figure out why.