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A callus is an overgrowth of keratin, the same protein as in fingernails. Constant rubbing or pressure stimulates the growths to protect the underlying skin from further irritation. A callus is typically less sensitive to touch than the normal skin surrounding it but can be painful if it becomes infected.

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1. Types of Calluses

There are two major types of calluses: discrete nucleated and diffuse-shearing. The first is a localized lesion with a central keratin plug. It is typically sensitive to touch and may be mistaken for a wart. Diffuse-shearing calluses usually measure over 1 centimeter across with no keratin plug and are usually painless.

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.