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Difficulty: MediumNeonatal Disorders

A female neonate, born at 40 weeks gestation following an uncomplicated pregnancy, is examined in the nursery on her second day of life due to a new-onset skin eruption. Her vital signs are within normal limits, and she is feeding vigorously without distress. Physical examination reveals scattered, splotchy erythematous macules, some of which contain central 1- to 2-mm pale yellow pustules. These lesions are prominent on her chest, back, and proximal arms, but are notably absent on her palms and soles. She exhibits normal primitive reflexes and has no apparent lymphadenopathy or hepatosplenomegaly. Which of the following is the most appropriate next step in the management of this patient's dermatologic findings?

  1. Reassurance and routine neonatal careAnswer
  2. B
    Initiation of intravenous acyclovir therapy
  3. C
    Administration of intravenous ampicillin and gentamicin
  4. D
    Application of topical mupirocin to the lesions
  5. E
    Obtaining a viral swab of the pustules for polymerase chain reaction

Answer

Reassurance and routine neonatal care
The correct management is reassurance and routine care because the clinical presentation is classic for erythema toxicum neonatorum (ETN). ETN is a benign, idiopathic, self-limited eruption that occurs in up to half of all full-term neonates, typically appearing within the first 24 to 72 hours of life. It is characterized by small, yellow-to-white papules or pustules surrounded by a wide erythematous base (often described as having a 'flea-bitten' appearance). Crucially, these lesions completely spare the palms and soles, and the infant is otherwise entirely healthy and well-appearing. Because ETN resolves spontaneously over several days to a week without sequelae, no diagnostic workup or pharmacologic treatment is indicated.

Step-by-Step Solution

1
Identify the key clinical features of the rash.
The rash consists of erythematous macules with central yellow pustules, primarily on the trunk and proximal extremities, sparing the palms and soles, appearing on day 2 of life.
Accurate characterization of the morphology, timing, and distribution of neonatal rashes is essential for diagnosis.
2
Evaluate the patient's overall clinical status.
The neonate is afebrile, feeding well, and has normal tone and reflexes, indicating a completely well-appearing child.
Systemic symptoms (e.g., fever, lethargy, poor feeding) differentiate dangerous infectious etiologies from benign physiologic rashes.
3
Synthesize the findings to establish a diagnosis.
The combination of the specific rash morphology, its timing, the classic sparing of the palms and soles, and the well-appearing status of the infant points definitively to erythema toxicum neonatorum (ETN).
ETN is a classic, benign, and transient condition that does not require medical intervention.
4
Determine the appropriate management.
Reassurance and routine care are indicated without the need for medications or further testing.
Because ETN is self-limited and non-infectious, medical interventions and invasive testing are contraindicated.

Key Concept

Erythema toxicum neonatorum is a common, benign, self-limited rash in neonates characterized by erythematous macules with central pustules that spare the palms and soles, requiring only clinical observation and parental reassurance.
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Topics

Neonatal Disorders

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