Well without actually seeing pics of it, no way to know, Do the scales looks weird like raised, eaten away, or damaged? If they look fine, then I would probably just chalk it up to coloring/pattern. I don't own any BRBs so I'm not really familiar with them but I know snakes can develop more or colors as they age. Like my big BCI girl has been developing more salmon coloring on her sides with each shed as she ages and she is now 3 years old.