When Dustin Poirier's daughter saw his face after the Max Holloway fight, she was genuinely worried for her daddy ... saying, "Oh no! You have a boo-boo dad!"

The footage is ridiculously cute -- and shows how sweet UFC fighters can be with their families when they're not destroying other people in the Octagon.

Of course, Dustin won a crazy bloody 5-round brawl with Holloway for the UFC interim lightweight title ... a fight where Dustin took some serious damage to the face.

One report says Poirier took 208 total strikes during the UFC 236 co-main event -- which is A LOT.

The good news, Dustin seems to be feeling pretty good, despite the bruising -- and told his daughter he was taking her to the zoo so they could "see the animals!"

After the fight, Dustin and Max couldn't have been more respectful toward each other -- each praising the other fighter for battling their hearts out.

#Respect.