I have what I think is a call us on the ball of my foot. it's very painful what do I do?

Hello. Thank you for posting.

Corns and calluses are hard, thickened areas of skin that form as a result of friction or pressure on the skin. Corns and calluses develop naturally to help protect the skin underneath them. More information in the resource below.

How to treat corns and calluses:
https://www.aad.org/public/skin-hair-nails/skin-care/corns-and-calluses