I have the exact same thing, koopmeister!
When I had hair, it was a little red area that extended down from the hairline in the back.
When I shaved, my wife pointed out that the mark actually extends upward on the bean...so what I had seen for years was only the tip of the iceberg.... LOL!
I don't sweat it...I guess if someone was standing directly behind me in line or something and really stared....they'd see it.
I figure as soon as it gets a tan goin'....it will minimize the mark.
So, here's to Minimizing the Mark!!!