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Difficulty: MediumPediatric Infectious Diseases

A 48-hour-old female newborn is evaluated during routine nursery rounds. She was born at 39 weeks of gestation via an uncomplicated spontaneous vaginal delivery to a 28-year-old primigravid woman. Maternal prenatal testing was negative for HIV, syphilis, and hepatitis B. Group B Streptococcus screening was negative. The infant has been breastfeeding well and has established normal bowel and bladder function. Her temperature is 37.1°C (98.8°F), pulse is 130/min, and respiratory rate is 42/min. On physical examination, she is alert and well-appearing. Skin examination reveals numerous 2- to 3-mm yellow-white pustules on a broad base of irregular erythema. The lesions are clustered primarily on her chest, abdomen, and back, but completely spare the palms and soles. The remainder of the physical examination, including neurologic reflexes and tone, is unremarkable. Which of the following is the most appropriate next step in the management of this patient?

  1. Reassurance and continuation of routine newborn careAnswer
  2. B
    Initiation of intravenous acyclovir therapy
  3. C
    Full sepsis evaluation and administration of ampicillin and gentamicin
  4. D
    Application of topical mupirocin ointment to the affected areas
  5. E
    Skin scraping of the lesions for a potassium hydroxide preparation

Answer

The correct answer is reassurance and continuation of routine newborn care.
The correct answer involves reassurance and routine newborn care. This patient is presenting with a classic case of erythema toxicum neonatorum (ETN). ETN is a very common, benign, and self-limited rash seen in up to half of all full-term neonates. It typically appears within the first 48 to 72 hours of life. The rash classically presents as small, yellow-white papules or pustules on a broad erythematous base, often described as having a 'flea-bitten' appearance. The eruption is predominantly located on the trunk and proximal extremities, with characteristic sparing of the palms and soles. Because infants with ETN are asymptomatic and systemically well, no diagnostic testing (such as Wright stains or cultures) or pharmacologic intervention is required. The condition resolves spontaneously over several days to weeks, making reassurance the most appropriate management.

Step-by-Step Solution

1
Analyze the patient's age and overall clinical status.
A 48-hour-old full-term neonate who is afebrile, feeding well, and systemically completely well.
To rule out signs of systemic toxicity or neonatal sepsis, which would dictate immediate aggressive management.
2
Characterize the morphology and distribution of the rash.
Yellow-white pustules on an erythematous base located on the trunk, with sparing of the palms and soles.
To differentiate between infectious causes (e.g., HSV, candidiasis, staphylococcal infection) and benign neonatal eruptions.
3
Synthesize the findings to establish a diagnosis.
The clinical picture is classic for erythema toxicum neonatorum (ETN).
The timing (first 2-3 days), typical 'flea-bitten' appearance, and well-appearing state confirm the diagnosis of ETN.
4
Determine the appropriate management for the established diagnosis.
Reassurance and routine newborn care.
ETN is a benign, self-limited condition that resolves spontaneously without pharmacologic therapy.

Key Concept

Erythema toxicum neonatorum is a benign, self-limited rash of unknown etiology that presents in the first few days of life with yellow-white pustules on an erythematous base (sparing palms and soles), requiring no intervention other than reassurance.
Estimated Time:1m 15s
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Topics

Pediatric Infectious Diseases

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