A strip of stuck shed on his neck is not a big deal, although your snake my find it itchy. Chances are if you raise the tanks humidity and provide somthing to scratch against he'll take care of things on his own. I have been adding a wet hide (basicly a plastic tub just big enough for Sampson to curl up in filled with moss that is kept damp) to increase the humidity. It has worked wonders for his sheds.