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Difficulty: MediumNeonatal Disorders

A 60-hour-old male neonate is evaluated in the maternity ward prior to planned hospital discharge. He was born at 38 weeks of gestation via an uncomplicated spontaneous vaginal delivery to a 27-year-old primigravid woman. The mother's prenatal laboratory screening was unremarkable, including negative serologies for syphilis, hepatitis B, and HIV, and she received adequate prenatal care. The neonate has been breastfeeding vigorously every 2 to 3 hours and has had normal urine and meconium output. His temperature is 36.9°C (98.4°F), heart rate is 142/min, and respiratory rate is 40/min. Physical examination reveals a well-appearing, active infant with a widespread skin eruption consisting of scattered 1- to 3-mm yellowish pustules situated on irregular, splotchy, erythematous macular bases. The lesions are prominent on the thorax, abdomen, and proximal extremities, but completely spare the palms and soles. The remainder of the physical examination, including neurologic tone and reflexes, is unremarkable. Which of the following is the most appropriate next step in management?

  1. Proceed with hospital discharge and routine pediatric follow-upAnswer
  2. B
    Admit for empirical intravenous antiviral therapy
  3. C
    Obtain blood and cerebrospinal fluid cultures followed by broad-spectrum antibiotic therapy
  4. D
    Apply topical mupirocin ointment to the affected skin lesions
  5. E
    Perform a skin scraping of the pustules for potassium hydroxide evaluation

Answer

Proceed with hospital discharge and routine pediatric follow-up
The correct answer is to proceed with hospital discharge and routine pediatric follow-up. The infant's clinical presentation is classic for erythema toxicum neonatorum (ETN), a benign, self-limited condition observed in up to 50% of healthy full-term newborns. It typically appears within the first 24 to 72 hours of life and is distinguished by yellowish papules or pustules superimposed on a blotchy, erythematous macular base. The rash is characteristically found on the trunk and proximal extremities, while completely sparing the palms and soles. Because ETN is entirely benign and resolves spontaneously without sequelae, no diagnostic testing or pharmacologic intervention is required. Since the infant is well-appearing, afebrile, and feeding adequately, routine newborn care and planned discharge can safely proceed.

Step-by-Step Solution

1
Analyze the patient's overall clinical status and vital signs.
The neonate is a healthy, full-term, 60-hour-old infant who is afebrile, feeding well, and has reassuring vital signs.
Establishing that the infant is not systemically ill is critical to rule out life-threatening conditions like neonatal sepsis or severe viral infections.
2
Evaluate the morphological characteristics and distribution of the skin lesions.
The rash is characterized by small pustules on splotchy erythematous bases located on the trunk and proximal extremities, with distinct sparing of the palms and soles.
Specific rash features differentiate benign neonatal dermatoses from infectious etiologies.
3
Synthesize the findings to determine the diagnosis and corresponding management.
The findings represent a classic case of erythema toxicum neonatorum (ETN), a common, benign, and self-resolving condition. Consequently, the correct management is strictly observational.
Unnecessary diagnostic testing and invasive empirical treatments must be avoided in neonates with clear-cut benign physiological adaptations.

Key Concept

Erythema toxicum neonatorum is a benign, self-limited rash in healthy neonates characterized by pustules on an erythematous base sparing the palms and soles; it requires only observation and routine care.
Estimated Time:1m 15s
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Topics

Neonatal Disorders

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