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Difficulty: EasyNeonatal Disorders

Match the following clinical presentations of common, benign neonatal skin findings with their correct diagnoses.

  • Erythematous macules with central yellow-white papules; microscopic evaluation of a smear reveals eosinophils.Erythema toxicum neonatorum
  • Small, firm, pearly-white papules prominent on the nose and cheeks caused by retained keratin.Milia
  • Blue-gray, poorly circumscribed macular patches typically found over the sacrum and buttocks in darker-skinned infants.Congenital dermal melanocytosis
  • Erythematous inflammatory papules and pustules on the face and scalp lacking true comedones, commonly presenting around 3 weeks of age.Neonatal cephalic pustulosis

Answer

The correct matches are: Erythema toxicum neonatorum (eosinophil-filled pustules), Milia (keratin-filled papules), Congenital dermal melanocytosis (blue-gray macules), and Neonatal cephalic pustulosis (comedone-free inflammatory pustules at 3 weeks).
Each condition has specific pathognomonic features that make them easily distinguishable on physical examination: Erythema toxicum neonatorum is characterized by an erythematous base with pustules full of eosinophils. Milia are distinct, tiny retained keratin cysts. Congenital dermal melanocytosis is recognized by lumbosacral blue-gray pigmentation. Neonatal cephalic pustulosis is an inflammatory reaction without true comedones.

Step-by-Step Solution

1
Analyze the description of the lesion's contents or distinctive physical features.
Key differentiating findings identified are eosinophils, retained keratin, blue-gray pigmentation, and an absence of comedones.
Differentiating benign neonatal rashes relies heavily on exact lesion morphology and timing.
2
Match the identified key findings to the classic neonatal dermatologic conditions.
Eosinophils link directly to erythema toxicum neonatorum; keratin cysts link to milia; blue-gray pigmentation links to congenital dermal melanocytosis; delayed presentation without comedones links to neonatal cephalic pustulosis.
Direct recall of hallmark clinical signs allows for immediate diagnosis of these common neonatal skin conditions.

Key Concept

Recognition of benign neonatal skin findings
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Topics

Neonatal Disorders

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