How do I get these to stop occurring? Been years now

It started after working at a Greenhouse where my feet would be in boots all day and probably be wet.. well now a few years later I still have this issue and it is worse now and the one of my heel is getting bigger and deeper it seems like. I have high arches and I get these weird callous things on my left foot mostly my right has it but barely its mostly my left heel and it is very annoying. Here is a picture:

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