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Dylan Hollman,1Ou Jia (Emilie) Wang,2 Joseph M. Lam, MD, FRCPC,3

1Faculty of Medicine, University of Alberta.2 Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
3Department of Pediatrics, Department of Dermatology and Skin Sciences, University of British Columbia, Vancouver, British Columbia, Canada.

CLINICAL TOOLS

Abstract: Collodion baby, estimated to occur in 1 in 100,000 newborns, is a visually striking clinical presentation seen in neonates that is often a sign of an underlying autosomal recessive congenital ichthyosis. The baby is wrapped in a taut, translucent membrane, which is often compared to plastic wrap, saran wrap, a cocoon, or armour. A formal clinical diagnosis is often not reached until shedding of the membrane reveals the underlying phenotype. This can be isolated or associated with other structural and systemic congenital abnormalities. Patients may require ongoing monitoring and sometimes surgical intervention. Collodion baby is a rare and challenging condition that requires multimodal management including dermatologic care, infection prevention, nutritional support, developmental monitoring, and procedural interventions, if needed.
Key Words: Collodion baby, ichthyosis, neonate, newborn, pediatrics, dermatology.

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Collodion baby is both a diagnosis and a clinical manifestation in newborns who commonly have autosomal recessive congenital ichthyosis.
A highly compromised skin barrier puts the patient at a high risk of both hypo-/hyperthermia, dehydration, poor growth, infection and several other organ-specific complications. Due to these increased risks, admission to the neonatal intensive care unit is necessary to facilitate close monitoring and access to a highly humidified incubator.
The collodion membrane (CM) is shed within 3 to 4 weeks, revealing the underlying ichthyosis. Special investigations can be undertaken before the membrane sheds such as a skin biopsy or blood work. These investigations can provide clinical clues to an earlier diagnosis. If the patient is stable, it is reasonable to wait for the membrane shedding to reveal an underlying diagnosis.
Petroleum-based moisturizers can protect the skin as the membrane peels off.
The most common underlying diagnoses of collodion baby are congenital ichthyosiform erythroderma and lamellar ichthyosis. However, an estimated 10% of patients will have near normal-appearing skin, referred to as self-improving collodion ichthyosis.
Skin barrier dysfunction can lead to significantly higher transepidermal water loss and poor temperature regulation. A highly humidified incubator (minimum 60%) can help reduce water loss and assist in adequate temperature regulation.
Other keys to management include close observation for signs of infection, dehydration, electrolyte imbalance and/or poor feeding/decreased growth velocity.
Topical petroleum-based lubricants should be applied multiple times per day while medicated ointments should be avoided due to risk of systemic toxicity.
Complications involving the lungs (chest constriction or respiratory distress), eyes (ectropion or keratitis) and ears (obstruction, conductive and sensorineural hearing loss) may also be seen. In these instances, consultations with pulmonology, ophthalmology or otorhinolaryngology may be necessary for comprehensive care.
Skin biopsy prior to membrane shedding is generally unhelpful but may provide disease-specific histological findings if done after the collodion sheds.
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Related Terms: Dermatology, Collodion baby, ichthyosis, neonate, newborn, pediatrics, dermatology
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