Worn grip on thumb

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This is a curiousity for me. I played for years and the only wear my golf glove showed was general. I could use the same glove for a year if i chose to. I stopped playing for a while then picked the clubs up again and had this terrbile problem of wearing a hole in the thumb of my glove, sometimes causing a blister. I could do this in a couple of weeks of playing/practicing.

The problem seems to have eased, i can still wear out a glove in that area but it takes a much longer period of time, about 2 months. Anyone experinced this and have thoughts on the cause?