Pressure. Too much of it. Relax, Loosen your grip. Stretch the skin so what is normally over your Adam's Apple isn't. Tilt your head way back as far as you can and then do half a swallow - your A's A will disappear while you shave the skin (complete the swallow and carry on breathing afterwards).
Weepers and too much pressure go hand in hand and remember point loading when you go over knobbly bits like your A's A.