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Milia are 1- to 2-mm pearly white or yellow papules caused by retention of keratin within the dermis. They occur in up to 50 percent of newborns. Milia occur most often on the forehead, cheeks, nose, and chin, but they may also occur on the upper trunk, limbs, penis, or mucous membranes. Milia disappear spontaneously, usually within the first month of life, although they may persist into the second or third month. Milia are a common source of parental concern, and simple reassurance about their benign, self-limited course is appropriate.