Well, I'm a lefty and when I start to bowl, the inside part of my thumb (left side) swells up and becomes raw. The outside part (for the most part) doesn't bother me. In addition to that, I have an unsightly bruise on the pad of my thumb that lines up with the top of my thumb hole (oval). What can I do to keep myself from squeezing and making it to where I can't bowl more than a few games? My span feels close, I'd say its on the shorter side than on the longer.
Thanks