A tennis player complains to the athletic trainer that she has a sharp pain in the ball of her right

A tennis player complains to the athletic trainer that she
has a sharp pain in the ball of her right foot. She says that it feels as
though she has stepped on a piece of glass. On inspection, the athletic trainer
observes excessive callus formation on the ball of the foot that is dotted with
a cluster of black specks. ?

What is this condition, and how should it be managed?