My month old BP has this scratch a quarter inch long running down his belly scales, it's not bleeding or anything and he's doing fine, but I don't know if I should be concerned. The scales are also darker down the scratch like its been there for a while. Maybe he was born with it. I don't know. I didn't notice it till now but I've only held him a couple times. It's about two and a half inches up from his vent. I'll try to get pics soon.