49ers RB Jordan Mason goes to the locker room early against the Cowboys

San Francisco 49ers running back Jordan Mason left the team's game against the Dallas Cowboys early Sunday evening.

Mason was injured after a six-yard carry in the first quarter, but jogged off the field and never went to the blue medical tent. He ended up returning to the game, but jogged to the locker room before the end of the half, according to ESPN's Nick Wagoner.

It is officially questionable whether he will return due to a shoulder injury.

The 49ers' offense was scheduled to take the field with just under three minutes left, so it wasn't just about getting a lead before halftime.

It's unclear what injured Mason on the previous carry, but he suffered a shoulder injury in Week 6 that made him questionable for Week 7 against the Chiefs.

He appeared to have gotten through the Chiefs game without any problems, but after just six runs Sunday night, he didn't go to the locker room.

These six transmissions had not been particularly effective. He had just 18 yards on a long run of six yards.