i'm not sure about his experience in live feeding, but Zincubus has a lotta emotions tied to anti-live feeding. it's not an American thing to feed live or bash those that don't, but he seems to take it personally. i prefer to feed frozen-thawed myself, but we are dealing with BP's here and they're notoriously picky eaters. i have a few BP's that take live only. I continue to attempt to convert them, but i will feed them live prey with supervision rather than let them shrivel up.
to OP, it looks like it's a scratch or bite on the scale above the eye. Looks like the rat may have gotten the actual eyeball too, which is attempting to scab up. movement from your BP is shifting and loosening the scab. get a vet to check the wound, also look for an infection. Best of luck.