Incomplete shed--> problems?

My corn shed yesterday and as I was helping him with the last little piece of his tail I noticed that a little piece on his head didn't come off. He HATES having his head touched so as soon as my finger goes near his head he runs away. I can't figure out what to do. Would it lead to any problems if I just left it alone? Would it come off in the next shed? The picture is huge, I know but otherwise you can't see the little piece on the head. I circled it so you know where to look. Any suggestions?