Podiatry is a field of healthcare devoted to the study and treatment of disorders of the foot, ankle, and sometimes knee, leg and hip (collectively known as the lower extremity). In this regard, the range of disorders of the lower extremity which podiatry can address is largely dependent on the scope of practice as per national, state, and/or provincial jurisdiction. Corns and calluses were described by Hippocrates who recognised the need to physically reduce hard skin, followed by removal of the cause. He invented skin scrapers for this purpose and these were the original scalpels. Celsus, a Roman scientist and philosopher was probably responsible for giving corns their name. Later Paul of Aegina (AD 615-690) defined a corn as "a white circular body like the head of a nail, forming in all parts of the body, but more especially on the soles of the feet and the toes.
Contributions by PodDPM, 188.8.131.52, and 184.108.40.206.