Thanks for the query.
On viewing the image furnished with your query, it seems to be a corn or a viral wart. Pressure effects can lead to callosity and hardness of the skin that presents with a corn which can be removed by surgical excision or even with regular application of salicylic acid which will soften the area and make it to wither off.
In case of a corn, you are recommended to wear slippers with soft soles and also avoid standing for long hours.
In case of a viral wart, it will need removal with cautery. Consult a dermatologist for an examination and a specific diagnosis.
Hope this helped.
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