As runners, we take a bizarre pride in the state of our feet, often trying to outdo each other with how battered our toes are: ‘Oh, you’ve only lost three nails? I’ve lost seven, plus two are black ...

A callus is a hard and thick patch of skin caused by friction or pressure, often on hands or feet. Calluses can be treated with salicylic acid, a pumice stone, or by a podiatrist. Calluses are not ...