A substance was visible on Michael Pineda's hand during the New York Yankees 4-1 win over the Boston Red Sox on Thursday night.

John Farrell said it wasn't brought to his attention until the fourth inning that Pineda had what appeared to be pine tar on the palm of his right hand.

When Pineda came out for the fifth inning, Farrell said it appeared the pitcher's hand had been wiped clean, so the manager never brought it to the attention of the umpiring crew.

After the game, Pineda said the substance was dirt.

"I don't use pine tar," he said. "It's dirt. I'm sweating on my hand too much in between innings."