Realmuto is being held out Monday due to soreness in his wrist/hand area, according to Joe Frisaro of MLB.com.
Realmuto was struck in the hand area by a foul ball during Sunday's contest, so he was held out of Monday's lineup in order to rest and recover. The report indicates Realmuto could get a couple days off, so while he does not appear to be dealing with anything serious, he could miss further action.