What is the common cause of keratomas or calluses?

Keratomas, commonly referred to as calluses, primarily develop due to consistent friction or pressure on the skin. When the skin experiences repetitive irritation, it responds by thickening as a protective mechanism to guard against injury. This thickened area, while serving a protective function, can become uncomfortable or unsightly if the friction continues over time.

The formation of calluses is typical in areas of the body that are subjected to frequent abrasion or pressure, such as the hands and feet. This natural response of the skin emphasizes how external physical factors can significantly influence skin health and appearance. Other options, while pertinent to skin issues, do not directly contribute to the specific formation of keratomas or calluses in the same way that consistent friction does.