Blisters nearly ruined his 2016 season and have limited his usage this year to two starts for a total of eight innings. He's been on the disabled list twice already and last pitched for the Dodgers on April 16.
Hill said his frustration is off the charts because after nearly a year fighting the blisters, and he isn't sure how the skin will react to snapping off curveball after curveball.
"It's just the friction," he said. "I can usually tell. It starts to get hot."
Ken Gurnick has covered the Dodgers since 1989, and for MLB.com since 2001. This story was not subject to the approval of Major League Baseball or its clubs.