EXCLUSIVE

Drake's muscle packs a mean punch ... according to the guy on the receiving end.

We got these pics of the injuries of producer/rapper Detail, who claims the bruises were inflicted at the hands of Drake's security guard.

We're told the injuries were so bad he was hospitalized for days ... with a broken jaw and other injuries that required several surgeries.

As we reported, Detail claims Drake invited him to his home back in 2014 on the pretext of working on a project, but it was really an ambush. Detail says Drake was pissed he wouldn't work exclusively with the Canadian rapper.

Detail says he was so badly hurt he couldn't work for a year, and he asked Drake repeatedly, and in vain, to cover his medical expenses. When Drake refused, Detail had lawyers, Panish Shea & Boyle, file a lawsuit.