Which skin condition is predominantly caused by repeated pressure?

Callouses are thickened areas of skin that develop in response to repeated pressure or friction. This skin condition occurs as a protective mechanism, where the skin builds up layers to shield itself from the stress caused by pressure, typically on areas of the feet or hands. For example, individuals who frequently engage in activities that put pressure on their hands or feet may develop callouses as the body’s way of adapting to protect the underlying tissue.

The other conditions listed do not primarily arise from repeated pressure. Brittle nails, for example, result from a variety of factors including nutritional deficiencies, environmental conditions, and underlying health issues, rather than pressure alone. Hyperhidrosis is characterized by excessive sweating and is typically linked to genetic factors or overactive sweat glands, not pressure. Onychia involves inflammation of the nail matrix, often due to infection or trauma, but again, does not derive from repetitive pressure as its primary cause.