What is another common name for calluses?

A callus is commonly recognized as a thickened and hardened area of skin that develops in response to pressure or friction. The medical term "keratoma" is often used to refer specifically to this type of skin formation, as keratoma refers to a growth of keratin on the skin. This term emphasizes the nature of calluses as a localized thickening of the skin.

In this case, while "perionychium" refers to the skin around the nails and "yellow skin" is not a specific term associated with calluses, "keratoma" is the most accurate synonym for calluses. Therefore, the correct choice highlights the established terminology within the field, providing clarity in understanding skin conditions relevant to manicurists and skin care professionals.