Thanks for the query,
You might have developed a plantar corn
It presents as a painful hole in feet, as mentioned by you,
The treatment for this is removing the dead skin with a blade.
You can try it yourself,
But best is to meet a dermatologist
Dont worry it is not a severe condition and can be easily treated.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.