CLEVELAND -- The Indians have long believed that if right-hander Adam Miller can stay healthy, he can help them at the big league level.

The Tribe will have to keep waiting.

Miller, the Tribe's top prospect at Triple-A Buffalo, is headed back to the disabled list with an open callus on the middle finger of his right pitching hand.

A blister on that same finger kept Miller from pitching in any Spring Training exhibition games for the Tribe this year and delayed his start to the Triple-A season by three weeks. Since his return from the DL on April 24, Miller has gone 0-1 with a 1.88 ERA in six starts for the Bisons. He's struck out 20 and walked 12 in 28 2/3 innings.

Miller, 23, was scratched from his scheduled start at Columbus on Sunday.

"I haven't gotten the full report on it," manager Eric Wedge said. "I feel bad for him. You have to be tough and ride it out."

Head athletic trainer Lonnie Soloff said this is a new injury, unrelated to the blister that held Miller up earlier this year. Soloff planned to provide more information Tuesday.

The Indians have said often that they expect Miller to impact the big league club this year, and they have not ruled out the possibility that he could debut in the bullpen. But until he remains healthy for a prolonged period, such thoughts aren't even being considered.