Yeah, if all the old skin came off in the shed, I totally agree with Deborah, and have that issue with my BP too.

Shayna, my 6 year old BP, has perfect sheds 95% of the time, but I still see a little blood from her vent area almost every shed. Such a small amount, doesn't seem to bother her too much, and she has no other symptoms, so I don't worry. It's just something that happens. Shayna seems to do it most sheds for the past 4-5 years.