Wilson, 9-5 with a 2.43 ERA, pitched in last season's All-Star Game as a Ranger and took the loss after allowing a three-run homer to Milwaukee's Prince Fielder, now with the Detroit Tigers, in the National League's 5-1 win.
Wilson said he has been battling issues with broken fingernails and blisters all season.
"Last year, I went and obviously didn't do very well. I'd like to pitch well to get back for that, but it's not really worth it," Wilson said. "This is an issue I've been fighting all year."