You may find, contrary to logic, that's it's kinda "normal."
My Frontier, Titan, and G35 Coupe all did the same thing. With the hood down, wiggle up and down on that corner... there may be a tiny bit of play in the hood hinge, or it may simply be the thin metal of the hood structure flexing.
I'd be way more concerned if it was the leading edge, rather than the trailing edge!
If it feels excessive, I'd run it by the dealer and ask if they can have a look.