PC has beaten me to it, I rub a bit of alum on the fingers for grip, pull the skin left, shave, pull the skin right, shave, and it's all done with no need to put a blade anywhere near the protrusion. The skin is pretty loose / mobile in that area.
Geofatboy on Youtube has a good clip on it where he demonstrates, and he also has another quite cool idea where he suggests swallowing and then kind of holding the swallow... that flattens the area quite effectively. Either way works.