Here are the pics from Shawn Oakman's 2013 domestic violence case -- which show the injuries he allegedly inflicted on his then-girlfriend ... while he was a member of the Baylor football team.

The accuser filed a police report at the time claiming Oakman roughed her up inside an apartment in January 2013 -- causing bruises on her arms and lips.

Despite brutal allegations that the 6'8" 275 pounder shoved her into a brick wall and cabinets and called her horrible names, she never pressed charged against Oakman.

As for Baylor's role -- it's unclear if he was disciplined by the school ... but he did not miss a single game in the following season.

Baylor has admitted it completely bungled the way it handled domestic violence allegations against football players over the years -- but has not specifically weighed in on this case.