Rosh Pediatrics Practice Exam

What skin condition often shows symptoms of tiny papules on extensor surfaces in children?

1. Keratosis pilaris

2. Erythema infectiosum

3. Urticaria

4. Diaper dermatitis

The correct answer is: Keratosis pilaris

The condition characterized by small papules on extensor surfaces in children is indeed keratosis pilaris. This benign skin disorder commonly manifests as tiny, rough, raised bumps, often on the outer sides of the upper arms, thighs, and occasionally the face. It results from the accumulation of keratin, the protein that protects the skin, which leads to the blockage of hair follicles. In children, keratosis pilaris is frequently seen and can be mistaken for a rash; however, it typically does not cause any symptoms like itching or discomfort. The papules are often more noticeable during colder months when the skin tends to be drier. Understanding this condition is key for pediatric care providers, as reassurances can often be provided to concerned parents about its harmless nature and the often self-limiting course of the condition as children grow. The other options mentioned represent different skin conditions that present with distinct characteristics and symptom locations, which do not align with the description of keratosis pilaris.