On the same day on which he was named American League Pitcher of the Month for April, Clay Buchholz found himself accused of doctoring the baseball Tuesday night.

Former minor-league pitcher Dirk Hayhurst, who wrote the well-received book "The Bullpen Gospels'' and now works for Rogers SportsNet in Toronto, said he saw video tape of Buchholz's seven-inning shutout performance Wednesday against the Blue Jays at Rogers Centre and detected a foreign substance on the pitcher's right forearm.

In a tweet, Hayhurst wrote: "Forget the hair, I just saw video of Buchholz loading the ball with some Eddie Harris worthy slick'em painted up his left forearm. Wow.''

Hayhurst guessed the substance was Crisco, and that the amount was "substantial".

"You could see it slathered on there," he tweeted.

Buchholz responded to SportsNet on the accusations.

"There's a resin bag behind the mound,'' said Buchholz, "and it's there for everybody to use every inning after our warm-up. [I] put resin on my arm throughout the game. Sweat, water, whatever . . . Sometimes, I put a little of water on my hip just to get moisture on your hands because sometimes the ball that they throw to you feel like cue balls off a pool table. Got to find a way to get a grip. But yeah, I mean, definitely no foreign objects or substances on my arm."

Red Sox manager John Farrell grew angry over the allegation.