Blisters & Dry Skin on Heel of Foot? (photo)

Hi, I seem to be getting a lot of blisters on the heel of my foot where there is a lot of calloused dry skin? I've tried special socks that are supposed to help blisters when I go to the gym, but I still get blisters? Do these blisters have anything to do with the calloused skin on the heal? Should I scrape off the dry skin with a pumice stone? Any other solutions? Thanks

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