Concussion treatment is a hot button NFL subject and it could be an issue in San Francisco in the coming days and weeks.Standout rookie safety Eric Reid suffered his second concussion of the season Sunday in a loss to Carolina. Reid went down hard after a violent collisions with Carolina running back Mike Tolbert. Reid also suffered a concussion in Week 2. He came back the next week.Like that time, Reid must pass a league test before being cleared to play.