Doctor's Notes on Corns and Calluses
Corns and calluses are skin conditions that consist of thickenings in the skin in areas of repeated pressure. They are typically located in the feet. Hyperkeratosis is the medical term for the thickened skin of corns and calluses. A callus describes a flatter, more diffuse area of thick skin, while corns are thick, localized bumps that usually have a papular, conical or circular shape. Corns and calluses are caused by increased pressure. This can occur due to abnormal anatomy of the feet, bony prominences in the feet, poorly-fitting footwear, abnormalities in gait or movement.
In addition to thickened skin, other associated symptoms can include pain (for corns) that may interfere with walking, and dry, flaky, or scaling skin.
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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.