Normally, UFC fighter Vicente Luque wouldn't give two craps how his face looked after going to war in the Octagon -- but this time it's different, he's getting MARRIED next month!
Luque was the winner of that INSANE 3-round brawl with Bryan Barberena on "UFC on ESPN 1" on Sunday night ... a fight that was so violent, each guy won a $50,000 fight of the night bonus!
Luque tells TMZ Sports ... he was in A LOT of pain after getting home Sunday night and could barely fall asleep because his face hurt so much.