Derm Dx: A waxy, yellowish plaque since birth

A 3-month-old male presents with a scalp lesion since birth. The child is normal developmentally, and his parents deny any history of genodermatoses or similar growths. Examination of the affected area reveals a 3-cm flesh-colored plaque with a yellowish hue and waxy surface texture. No other skin abnormalities are detected on physical examination.