[Blueicus]

Any cook who uses a knife with any regularity will have a knife callous at the bottom of their right (or left) index finger, provided you use the standard grip. Of course, you can't have a callous without a blister, so you're on your way. A sharp knife will help prevent it, but it will be inevitable, so you'll have to learn to live with it. Once the callous becomes established you shouldn't have any more problems.