My 3 mo old ball shed for the first time since I have had him and it was a pretty bad shed. Anyway I followed the tips in the sticky and got all of it off except for a piece and is right behind his head for about 2in. Its just on his underside. I couldn't seem to get it off and I didn't want to stress him out to much trying to get it off. Is this a big deal? Will it just come off on its on or the next shed?