In plain words
Erythema toxicum neonatorum is a common rash in newborns. It looks like red blotches with small white or yellow bumps in the center. It often appears on the chest, back, arms, and face, and it can move around. It usually shows up between day one and day three, and it fades within a week or two. The cause is not fully known, and it is not an allergy or an infection. Most babies who get it are healthy and need no treatment. Mothers often notice it while bathing or dressing the baby. If the rash comes with fever, poor feeding, unusual sleepiness, or spreads with blisters or pus, call your pediatrician the same day, because those signs need checking.
The deeper version
Erythema toxicum neonatorum (ETN) is a self-limited eosinophil-rich skin eruption of unclear etiology, affecting an estimated 30 to 70 percent of term newborns, with onset at 24 to 72 hours and resolution within 1 to 2 weeks in most cases. Histology shows eosinophils around hair follicles and in the superficial dermis. Differential diagnoses include transient neonatal pustular melanosis, infantile acropustulosis, and Candida or staphylococcal infection, which require clinical assessment. Smear and Gram stain of the pustule distinguish ETN from infection when needed. Prevalence estimates vary by population, gestational age, and assessment method. The condition is described in standard neonatal dermatology texts and has no specific evidence-based treatment.
Where it comes up
- Baby acne, cradle cap, and rashesBaby Basics
- Bathing a newbornBaby Basics
- Newborn procedures: vitamin K, eye ointment, hepatitis B, screeningGetting Ready for Birth
- When to call the pediatrician (and when to go in)Baby Basics
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Sources
- American Academy of Pediatrics — Red Book: 2024-2027 Report of the Committee on Infectious Diseases, neonatal skin conditions section
- Hernandez Gonzalez MA et al. — Neonatal skin conditions review, Archives of Dermatology, 2011