amyers my thumb dose the same thing just in different spots on the inside of my thumb I have blistered in 2 spots because of being out of tape and I use vise skin protection tape grey/black but since I have put the tape on It has not blistered but then the other side of my thumb blisters too once and awhile depending on the humity so all I do is take another pieace of tape and cut it in half.
and I use that half of tape on the other side makes my release alittle slippery but it also tightens up my thumb hole to counter it so it dose not just fall off my hand but after a few throws I get use to it.
but with tape comes different colours and each is different I have only used vise because that's all are proshop had I use to use red after 1 time with red it was a lot slippery then the grey/black and I also still blistered under the tape with the red so you should go with the grey/black one for now.
another thing that could be causing this is your thumb is turning in the thumb hole on your swing or before the push away I use to do this and with putting tape on my thumb it was helped me from not blistern as much and at the same time learning to not have my thumb turn in the thumb hole
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