Our expert says:
Good for you, well done!
Interesting question, I must confess that I've not heard of this before, at least not where you describe. First thing is don't pop anything unless you're sure it's a blister! The heat may just be abrading the skin there.
If they're not sore, then leave them (not too many people will see the bottom of your feet, luckily!), and in time, they may form a type of callous that settles and then you no longer have that problem!
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