Match each of the following benign neonatal skin findings with its most likely clinical diagnosis.
- Blotchy erythematous macules with central tiny papules and pustules appearing on the trunk and face of a 48-hour-old neonate; Wright stain of the exudate shows a predominance of eosinophils.Erythema toxicum neonatorum
- Superficial pustules lacking surrounding erythema present at delivery, which rapidly rupture to leave hyperpigmented macules with a collarette of scale; microscopic examination shows abundant neutrophils.Transient neonatal pustular melanosis
- Firm, 1- to 2-millimeter pearly white papules concentrated on the nose, cheeks, and chin of a newborn, representing benign retention of keratin within the pilosebaceous units.Milia
- A flat, homogeneous, blue-gray patch with indistinct borders located on the sacrum and buttocks of a healthy newborn, caused by delayed disappearance of dermal melanocytes.Congenital dermal melanocytosis
Answer
The presentation with eosinophils at 48 hours matches Erythema toxicum neonatorum. The presentation with neutrophils at birth matches Transient neonatal pustular melanosis. The pearly white facial papules match Milia. The blue-gray sacral patch matches Congenital dermal melanocytosis.
Each benign neonatal skin finding has a distinct clinical presentation, cellular composition, and temporal onset. Erythema toxicum neonatorum typically appears on days 2-3 of life with eosinophil-filled pustules. Transient neonatal pustular melanosis is present at birth, lacks surrounding erythema, leaves hyperpigmented macules, and contains neutrophils. Milia are benign keratin-filled cysts presenting as firm white papules on the face. Congenital dermal melanocytosis presents as blue-gray patches over the lower back and buttocks due to deep dermal melanocytes.
Step-by-Step Solution
Key Concept
Differentiation of benign neonatal dermatologic findings