Prey doesn't usually bleed unless it popped... but even then, that doesn't look like dried blood on top of the scales. It looks like there are a couple problems going on that may or may not be related. I say wait for the shed because scale rot and/or mild burns tend to correct with sheds as long as the things that caused them in the first place are addressed. I'm not a vet and I don't know what OP's set up is, so I can only sort of guess at the problem based on what I've experienced my self (mild scale rot on the chin that occurred when a snake in QT tipped over a full water bowl, pooped/peed, then sat in it all day while I was at work because they are a nasty little grubby goblin).
Brownish spots look like they could be scale rot and/or burn. Blood spots could also be burn. if the snake sheds and the damaged scales come off with it, we'll be able to see what's going on under the affected scales.