Contreras was removed from Sunday's game against the Rays after being hit in the left hand/wrist area by a pitch during the first inning, Gabrielle Starr of the Boston Herald reports.
After getting plunked by a 94.2 mph sinker, Contreras was able to take his base, but the Red Sox pulled him from the contest to begin the second inning. Contreras will presumably undergo X-rays to determine whether he's dealing with any structural damage.