Which skin condition involves the overproduction of skin cells leading to scaling?

The correct answer is psoriasis, a chronic autoimmune condition characterized by the rapid overproduction of skin cells. This results in the accumulation of these excess cells on the skin's surface, forming thick, silvery-white scales. These scales can lead to red patches of skin that can be itchy and sometimes painful. The condition is often associated with inflammation and can flare up due to various triggers, including stress, infections, or environmental factors.

In contrast, acne vulgaris is primarily a disorder of the pilosebaceous units caused by factors like hormonal changes and bacteria, resulting in comedones or pimples, but does not specifically involve scaling due to cell overproduction. Dandruff is a milder condition that involves flaking of the scalp's skin but does not have the same extent of skin cell overproduction and scaling seen in psoriasis. Contact dermatitis, on the other hand, is an inflammatory response to allergens or irritants affecting the skin, leading typically to red, itchy, and inflamed skin rather than the specific scaling associated with psoriasis.