Corns and calluses are thick, hardened layers of skin that develop when your skin attempts to protects itself from increased friction and pressure. Choosing the right shoes can help prevent the development of uncomfortable corns and calluses on your feet. The American Podiatric Medical Association recommends the following prevention tips: make sure you only wear shoes that fit properly; consult your podiatrist if you have a foot deformity or problem that requires special shoes; and wear gel pad inserts inside your shoes to ease pressure points.
American Podiatric Medical Association, October 2016