Ben Askren Busts Eyelid Open During Wrestling Session

Ben Askren had an eye-opening experience on the mats this week ... 'cause the former UFC star suffered a nasty injury during a wrestling session -- and it'll make your skin crawl.

Funky showed off the battle wound on Thursday ... saying, "still shooting so fast these young boys can’t sprawl quick enough."

The incident seemingly happened as he was wrestling with college athlete Mitchell Mesenbrink ... who jokingly denied Askren's claim that he got the business during the workout.

As for the injury, Ben was able to get stitched up on the spot ... with a crowd of people watching as he lay on the floor to close the gash on his eyelid.

The cut is gruesome, but apparently not enough to where the folks in attendance wanted to look away.

The patchwork seemed to work out just fine ... as Ben shared a snapshot smiling after his skin was sewn back together.

Askren's been getting beaten up lately -- earlier this week, he showed off a shiner on his eye.