It sounds very possible that you may have case of athlete's foot...
This if the case of course is caused by a fungal infection ...
It would be very helpful if you might be able to post picture of the skin on this page ...
If athlete's foot then you may benefit from topical treanent such as Lamisil cream twice a day for 2 to 4 weeks
It can be more stubborn on the thick skin of the bottom of the foot and combining oral treatment PLUS topical may be more helpful to clear it up in a lasting treatment
So seeing your octor perhaps and treatment with oral Lamisil ( by prescription ) 250mg a day plus topical treatment Lamisil or other ...
The combination is more of a thorough approach I would say
I hope that this information is helpful for you
Let me know if you have further questions or concerns or pictures
I will be happy to get back with you
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Thank you and Best Regards,
Anthony Bray MD