Answer :
Final answer:
Calluses form on the skin due to constant pressure and friction, with corns being a specialized type. Ballet dancers may develop calluses on their toe joints from the pressure of pointe shoes.
Explanation:
Calluses form when there is constant pressure and friction on the skin, triggering basal stem cells to thicken the skin as a protective measure. A corn is a specialized form of callus that forms due to abrasions from elliptical-type motion. Ballet dancers can develop calluses on their toe joints from the pressure and friction caused by pointe shoes.
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