currently i have my thumb pitched away half an inch with no lateral pitch. I have always had callauses on the left side of my thumb that wraps around the entire side of my thumb. I am left handed, so to be clear if u were to hold up ur left thumb so it is pointing up my callause is on the left side. my question is, only recently it has begun hurting, most likely because i switched my thumb to the half away, before it was o front to back with a 1/8 laterl out to the right. i changed because i could not clear the front of the ball no matter how much bevel i used. so my question is will increasing the latteral out pitch relief or add pressure to the left of my thumb.
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I've always heard to change pitches an 1/8" at a time. 1/8 to 1/2 is nuts. You're probably squeezing the ball to hold on to it thus causing the callusing.

I think everyone who bowls regularly gets at least some callousing.  

I just use my old disposable razors to shave them down.  Just go over the callous lightly over and over, occasionally knocking the dead skin out from between the blades.  The razor will only shave off the dead, dried up callous and won't harm your healthy skin.

Just make sure you don't shave it too much or it will be a little tender, also be careful of moving the razor sideways or snagging it on your cuticle.

I think you'll be really happy with the result and it shouldn't hurt anymore.
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ILBT!

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