Dillon Danis -- a former Bellator fighter and Conor McGregor's good pal -- was punched in the eye during a wild altercation outside of a boxing event on Friday ... just minutes after he had a crazy run-in with KSI.
Here's the deal ... KSI and a bunch of other famed fighters and celeb boxers were at a hotel conference room in Austin, Texas for the weigh-ins for the YouTuber's Misfits Series 3 event this weekend -- when Danis rolled up from the crowd to confront KSI.