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Difficulty: MediumNeonatal Disorders

A 48-hour-old female newborn is evaluated in the nursery for a new skin eruption. She was delivered vaginally at 40 weeks of gestation following an uncomplicated pregnancy. Maternal prenatal laboratory results, including a rectovaginal swab for group B Streptococcus, were negative. The patient's temperature is 37.0°C (98.6°F), heart rate is 140/min, and respiratory rate is 42/min. Physical examination reveals an alert, vigorous infant who is feeding adequately at the breast. Skin examination shows numerous 2-mm pale yellow pustules, each surrounded by a prominent, blotchy erythematous macular base. The lesions are scattered widely over the infant's trunk, face, and proximal arms, but the palms, soles, and mucous membranes are completely spared. Which of the following is the most appropriate next step in management for this patient?

  1. Observation and routine neonatal careAnswer
  2. B
    Gram stain and fluid culture of the lesions
  3. C
    Administration of intravenous ampicillin and gentamicin
  4. D
    Application of topical hydrocortisone
  5. E
    Initiation of intravenous acyclovir therapy

Answer

Observation and routine neonatal care
The clinical presentation of scattered 2-mm pale yellow pustules on a blotchy erythematous base in an otherwise healthy, vigorous, and afebrile neonate is the classic description of erythema toxicum neonatorum (ETN). Often described as having a 'flea-bitten' appearance, this idiopathic and entirely benign skin condition typically appears within the first 24 to 72 hours of life. A key distinguishing feature is that it characteristically spares the palms and soles. Because ETN is asymptomatic and resolves spontaneously without scarring—usually within one week—the most appropriate management is clinical observation alongside parental reassurance. No diagnostic testing or medical intervention is required.

Step-by-Step Solution

1
Analyze the morphological features and distribution of the rash.
The lesions are characterized as 2-mm yellow pustules on a blotchy erythematous base, appearing within the first 48 hours of life, and notably sparing the palms and soles.
Identifying the primary lesion type and exact distribution is crucial for differentiating benign neonatal dermatoses from infectious eruptions.
2
Assess the patient's systemic clinical status.
The neonate is afebrile with normal vital signs, alert, vigorous, and feeding well without respiratory distress or lethargy.
The absence of systemic symptoms severely reduces the pretest probability of severe infectious etiologies like neonatal sepsis or disseminated viral infections.
3
Synthesize findings to establish the most likely diagnosis.
The combination of the classic 'flea-bitten' rash appearance and a reassuring clinical exam points to a diagnosis of erythema toxicum neonatorum.
Erythema toxicum neonatorum classically presents precisely this way in term infants within the first 72 hours of life.
4
Determine the required management based on the diagnosis.
The correct management is simple observation and reassurance.
Because the condition is benign and self-limiting, invasive diagnostic testing or empirical pharmacotherapy is unnecessary and potentially harmful.

Key Concept

Erythema toxicum neonatorum is a benign, self-limited rash typically presenting in the first 72 hours of life as small pustules on an erythematous base (sparing palms/soles) in a healthy neonate; it requires only clinical observation.
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Neonatal Disorders

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