Hi there...
This lesion is ? Unilateral (one sided)
In that case, need not be footwear related.
A clearer pic and detailed history is required to make a pucca diagnosis and give you a prescription.
You will probably be best served by connecting directly using this App's INSTANT ONLINE Consultation or a related App like Apollo 24/7 🙏
It is not something to worry about but needs to be sorted.
Health Tips
Avoid OTC products, home remedies, self medications and Dr Google's suggestions 🙏