My ball gets a COMPLETELY pink belly too when he is about to shed. Scared the bejeebes out of me the first time I noticed it. As for the potential biting, it is possible, but if he has a similar personality as other balls I have seen, he'll just duck away fast as you get close. My boa on the other hand, has tagged me before, but it was so fast I didn't even get a chance to feel it and I proceeded to pick him up.