What common skin condition is characterized by a buildup of keratin in hair follicles, leading to small bumps on the arms?

• A. Psoriasis
• B. Keratosis pilaris
• C. Acne
• D. Eczema

Answer: (B)

The skin condition characterized by a buildup of keratin in hair follicles, which results in small, gooseflesh-like bumps on the arms, is keratosis pilaris. This condition occurs when dead skin cells clog hair follicles, preventing the natural shedding of these cells. As a result, small, often red or flesh-colored bumps appear, usually on the upper arms, thighs, face, or buttocks. It's considered harmless and is commonly seen in adolescents but can occur in individuals of all ages.

Psoriasis primarily involves rapid skin cell production, leading to thick, scaly patches that can occur anywhere on the body, not exclusively in hair follicles. Acne involves the blockage of hair follicles but is due to oil and bacteria rather than a keratin buildup specifically. Eczema describes a broad spectrum of inflammatory skin conditions that result in itchy, inflamed skin, which is also distinct from the keratin-related bumps seen in keratosis pilaris.