A callous in this spot usually means that the ball is sitting more toward that side during the swing, therefore your hand is on the inside part of the ball. It's pretty common and usually considered to be a good thing and generally means the ball is sitting in your hand correctly. It's basically a pivot point on your hand created by the balls movement in your swing and release.
A bowling glove is about the best solution. Like the Ebonite React-R Glove, but you could get a golf glove and just cut the fingers off.
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