title: Neonatal erythroderma.
abstract: OBJECTIVE
  Neonatal erythroderma is a potentially life-threatening condition in neonates less than 1 month old. During the first month of life, erythroderma is generally a presentation of genodermatosis, primary immune deficiency, or, more exceptionally, severe psoriasis, metabolic disease or infection. Atopic erythroderma is observed later in life, usually after the age of 1 month. Rapid determination of the underlying cause is crucial for better management. However, the diagnosis is often a challenge for the clinician and is frequently delayed due to the nonspecific nature of the clinical signs. We summarize the different causes of neonatal erythrodermas and list their clinical, biological, histological, and sometimes genetic characteristics.
  
  
  RESULTS
  Severe erythroderma, typified by early onset, skin induration, severe alopecia and failure to thrive, is immediately suggestive of immunodeficiency or Netherton syndrome. In such cases, an early skin biopsy may be particularly of use in allowing accurate differentiation between these two disorders.
  
  
  CONCLUSIONS
  This review outlines the clinical and histological features of these disorders and suggests an approach to their differential diagnosis and management.
authors.affiliation: Department of Pathology, Hôpital Necker-Enfants Malades, and Université René-Descartes, Paris, France. sylvie.fraitag@nck.aphp.fr
authors.forename: Sylvie
authors.initials: S
authors.lastname: Fraitag
authors.forename: Christine
authors.initials: C
authors.lastname: Bodemer
mesh_terms: D001706:Biopsy; D003873:Dermatitis, Exfoliative / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D003937:Diagnosis, Differential; D042241:Early Diagnosis; D006801:Humans; D007231:Infant, Newborn; D011379:Prognosis; D012307:Risk Factors; D012867:Skin / Q000473:pathology*; D015996:Survival Rate / Q000639:trends; D014481:United States / Q000453:epidemiology