If you are feeding something that large that their skin can get stuck around it then you have other issues. And just incase you never noticed their skin is rather loose during shedding it in fact stretches. Now I am not saying that you have not seen that happen before but I just cannot see how it would cause a problem they arent going to be moving around and trying to shed while digesting anyways. And as stated before if you did have one try to shed then the skin would either tear or peal right off over the lump.