A callus is a broad-based, thickened patch of skin that forms in response to repeated pressure or friction forces, often a consequence of excessive weight bearing or frequent rubbing of the skin by footwear. It is an accumulation of dead skin cells at the surface layer of the skin that harden and thicken to protect the body. This thickening is called hyperkeratosis. Calluses can form over any bony prominence, though they are typically found on the palms of the hands and soles ...

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