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Duffey has been sidelined since Feb. 26 after having surgery to remove a cancerous mole from his back, MLB.com reports. He started light baseball activity Wednesday.
A suspicious mole on Duffey's back was diagnosed as melanoma during an exam early in spring training. Duffey hopes to pitch in games by the end of spring training, but it appears likely he'll begin the season on the injured list. He signed a minor-league deal with the Royals and is attempting to win a spot in the major-league bullpen this spring.
