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corn (callus) -- Britannica Online Encyclopedia
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corn

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corn, in skin disease, horny thickening of the skin on the foot or toes, produced by repeated friction or pressure. Extensive proliferation of the stratum corneum, the horny layer of the epidermis, results in a conical callus with its broad end on the surface and its point directed inward; the dense centre of this cone presses on sensory nerves, causing pain when direct pressure is applied. The corn’s surface is usually hard and shiny, but corns between the toes may be soft and soggy from perspiration.

Corns are treated by applying plasters of salicylic or dichloroacetic acid to the site ... (100 of 147 words)

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Assorted References

  • association with callus  (in  callus (dermatology))

    ...hands and feet. They are usually yellowish white, flat, and painless. When a callus is conical in shape, penetrating into the deeper layer of the skin and causing pain when pressed, it is called a corn.

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Corn - Student Encyclopedia (Ages 11 and up)

a local hardening and thickening of skin on the foot or toes caused by repeated friction or pressure; looks like a cone-shaped callus with the broad end on the surface and the point directed inward; direct pressure causes pain; treated by applying plasters of salicylic or dichloroacetic acid to site after core has been removed and callus pared; changing footwear or walking habits to remove cause of pressure helps corns from recurring and may prevent formation of a bony spur that must be removed surgically.

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External Web Sites
The topic corn is discussed at the following external Web sites.
The Nemours Foundation - Kids’ Health for Kids - Blisters, Calluses and Corns
eMedicineHealth - Corns and Calluses
Better Health Channel - Corn and Callus
How Stuff Works - Health - Corns
How Stuff Works - Healthguide - Corns And Calluses
Aetna InteliHealth - Diseases & Conditions - Corn and Callus
Information on these ’forms of hyperkeratosis.’ Contains notes on symptoms, diagnosis, and treatment.

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"corn." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 10 Oct. 2011. <http://www.britannica.com/EBchecked/topic/137788/corn>.

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corn. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/137788/corn

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