A couple questions about my BP.

He shed the other day and there were two small areas of the substrate (unprinted newspaper) that had some blood on it. I couldn't tell where it came from and there is no obvious injury. Is this normal during a shed??

Also, hopefully I can explain this so it makes sense, but he seems to have some extra skin around the whole length of his body. Almost like hes growing into his skin. Does this make sense?
Hes about 2 and I feed him one sm/med F/T rat weekly. I was wondering if this is normal or if it might be that he is underweight.