Big toe issue- running

Hello, I’m a runner and do a lot of long runs over 20 miles, frequently. I have developed an issues that I have not been able to find any info on. On the out side of my big toes, I have developed what can best described a callus, however it does not seem to be from rubbing or abrasion.

Hello, I’m a runner and do a lot of long runs over 20 miles, frequently. I have developed an issues that I have not been able to find any info on. On the out side of my big toes, I have developed what can best described a callus, however it does not seem to be from rubbing or abrasion.

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Big toe issue- running