What are milia in newborns commonly described as?

Milia in newborns are commonly described as inclusion cysts that contain keratinized stratum corneum. These tiny, white or yellowish bumps appear on a newborn's face, particularly on the cheeks, nose, and chin. They are formed when keratin, a protein found in skin, becomes trapped beneath the surface of the skin. This is a normal occurrence in infants and typically resolves on its own without treatment, usually within the first few weeks of life.

Understanding the nature of milia is important for parents and caregivers, as it helps to differentiate between these benign cysts and other skin conditions that may require medical attention. Unlike the other options, which describe various skin lesions or conditions, milia's specific composition and developmental origin as keratin-filled cysts distinguish them clearly in the context of newborn dermatological conditions.