What describes keratosis?

Keratosis refers to a skin condition characterized by the abnormal thickening of the outer layer of skin cells, known as the stratum corneum. This thickening occurs as a protective response and can be caused by various factors, including sun exposure, irritation, or genetic predisposition. Common forms of keratosis include seborrheic keratosis and actinic keratosis.

The incorrect options relate to other skin conditions. For instance, the thinning of skin cells is associated with atrophy and other dermatological changes, rather than keratosis. Normal skin aging does involve changes in skin texture and composition, but it does not specifically denote an abnormal build-up of skin. In addition, conditions related to acne scars involve changes in skin texture and pigmentation, which does not align with the definition of keratosis.

Therefore, understanding keratosis as a condition that involves an abnormal thickening of skin cells helps clarify its role in dermatological health and disease.