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What is a callus?

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Calluses are thickenings of the outermost layer of the skin. They're painless. They can form on hands, feet, or anywhere there is repeated friction -- even on a violinist's chin. There are different types of calluses. The common callus usually happens when there's been a lot of rubbing against the hands or feet. A plantar callus is found on the bottom of the foot.

SOURCES: The Mayo Clinic. Community Health Care Medical Library.

Reviewed by Lisa Bernstein on March 27, 2017

SOURCES: The Mayo Clinic. Community Health Care Medical Library.

Reviewed by Lisa Bernstein on March 27, 2017

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What causes corns and calluses?

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