A little background: 24 years old, male, non-smoker, non-drinker, fairly active, healthy eater.
I noticed a lump right below my skin on top of my jawline, maybe 1.5" from the chin midline. The odd thing about it was it wasn't perfectly round, more of a long, almost ovoid shape. It was firm, but not hard, and well defined. It was not fixed and seemed movable, although it might have been fixed to the upper layer of skin, it was hard to tell.