It seems that you may be having corns on sole of foot.
The skin of lesions may be hard and thick.
They may be due to pressure on sole during walking.
There may be tendency to develop corn.
You apply salicyclic acid containing solution on the lesion.
Avoid to walk barefooted. Take rest
Take oral vitamin A
capsule for long time.
However, you consult dermatologist
I hope you got my answer.
Dr. Ilyas Patel MD