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Calluses are thick, rough patches of skin that many people have on the bottom of their feet. They are often found under the ball or heel of the foot. Sometimes they cause a burning sensation, and they may cause discomfort. However, they usually aren't dangerous.
Excessive pressure and friction on one area of the foot cause skin cells to multiply and then die, forming a thickened area of skin known as a corn or a callus, depending on its location.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.