Question

A client complains to the health care provider that he keeps getting hard skin on the sides of the great and little toes when he wears certain pairs of shoes.

Answer 1

This is probably caused by ill-fitting shoes putting pressure on certain areas of the foot and would be called a Corn.
In this context, corn refers to some sort of calluses that appear if we constantly use ill-fitting shoes. The pressure that caused by the ill-fitting shoes will create some sort friction that will make the skin on that area become thicken.