I've used MC tape for many years and had issues when I bowled more than 20 games a week. With a very snug thumb fit and the friction between my thumb and the MC tape, it roughened up my skin on the back of the thumb and darkened it. Not a callous.
Depending on the texture and thickness of you skin behind the thumb, velcro can cause irritation or open up your skin. Especially if you have the wrong pitch/size/thumb fit. I put MC tape on a very old turbo x which had reverse in the thumb and I ended up with a type of road rash on my thumb lol.... just take it slow is what I'm trying to say.... good luck.
I still use MC tape and my thumb can handle it now, only swelling happens quicker with MC tape when I bowl more games/blocks.