Illinois Nail Technician Practice Exam 2026 – Complete Prep Guide

Hyperkeratosis refers to a condition characterized by an excessive buildup of keratin on the skin's surface, which results in thickened, hardened skin. This condition often manifests as rough, scaly patches that may appear on various parts of the body, including the palms of the hands and soles of the feet. The presence of hyperkeratosis indicates a protective response to continual friction, pressure, or irritation.

The other options—thin skin, sensitive skin, and moist skin—do not accurately describe the characteristics produced by hyperkeratosis. Thin skin is associated with a lack of the natural protective layers, sensitive skin refers to skin that reacts more easily to irritants, and moist skin suggests a hydrating condition rather than a hardened one. Therefore, understanding hyperkeratosis as a condition that denotes hard skin helps clarify its nature and distinguish it from other skin types or conditions.