It's the skin that does protrude when they get cherry eye :-/ it's the third eyelid and the fact that you can see it doesn't necessarily mean it's bad he may go his whole life with out ever getting one!!! Unfortunately I know all about this third eyelid we had to have all the excess of our girls removed because shed get 4-5 cherry eyes per day!!!!!! But knock on wood since she had her surgery she hasn't had a single one !!!!!! If he does ever start to get them I'd suggest having it tightened ASAP we weighed the pros n cons of stitching vs removal n removal is so much better her eyes r perkier n she doesn't have dry eye like some vets will warn u about although some bullies naturally have dry eyes !!!!!!