A podiatrist is a foot doctor.
In UK they are specialists in disorders of the lower limbs and feet
In order to be eligible for Health Professions Council registration and, therefore, employment within the NHS and to be accepted as a member of The Society of Chiropodists and Podiatrists you need to...
http://www.feetforlife.org/careers/scope.html
Podiatrist will study, diagnos, and treat of disorders of the foot, ankle, and lower leg.
Podiatrist is pronounced po·di·a·trist (puh-dahy-uh-trist).