What are temporary thickenings of the stratum corneum due to excessive friction called?

Temporary thickenings of the stratum corneum due to excessive friction are called corns. Corns typically develop on areas of the skin that experience repeated pressure or friction, such as the toes. The stratum corneum, the outermost layer of the epidermis, thickens in response to this mechanical stress as a protective adaptation. This helps to prevent damage to the underlying tissues.

While calluses also refer to thickened areas of skin resulting from friction, they are generally larger and can be more widespread, typically forming on the palms of the hands and the soles of the feet. Blisters, on the other hand, are fluid-filled sacs that form in response to friction, but they do not involve a thickening of the stratum corneum. Warts are benign growths caused by viral infections and are distinct in nature from corn formation. Recognizing these differences is crucial for understanding skin responses to environmental changes and pressures.