Harrison was removed during the third inning of Wednesday's Cactus League game against the Angels due to a blister on his left index finger, Sophia Minnaert of FanDuel Sports Network Wisconsin reports.
Harrison tossed 59 pitches across 2.2 frames and allowed four runs (one earned) on four hits while striking out three before being removed from Wednesday's contest. Brewers manager Pat Murphy told reporters that the blister is something Harrison has been dealing with, so the issue doesn't appear to be one that would put the 24-year-old southpaw in jeopardy of missing Opening Day, per Curt Hogg of the Milwaukee Journal Sentinel.