A guy in Indiana got a Romney Tattoo on the side of his face...and $15,000!

He auctioned off a five-by-two-inch spot on the side of his head . . . He turned down the highest bid, because they asked for something that wasn't appropriate...

The second-highest bidder was a Republican . . . who paid $15,000 to have a MITT ROMNEY campaign logo tattooed there.

Eric is a registered Republican, so he was cool with the tattoo.  Now he's planning to auction off space on his forehead . . . but he says he won't get an O for BARACK OBAMA.

(ABC News)