Erythema Toxicum Neonatorum Workup

  • Author: Neil F Gibbs, MD; Chief Editor: Dirk M Elston, MD   more...
 
Updated: Jan 24, 2012
 

Laboratory Studies

  • Erythema toxicum neonatorum (ETN) is diagnosed clinically based on history, physical examination, and peripheral smear of intralesional contents.
  • On a CBC count, eosinophilia are noted in approximately 15% of patients as up to 18% of the total WBC count. Eosinophilia may be more pronounced when the eruption shows a marked pustular component.
  • A Tzanck smear or Gram stain performed on intralesional contents is essential for diagnosis. Inflammatory cells are present, with greater than 90% eosinophils and variable numbers of neutrophils.[20]
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Other Tests

  • Perform viral, bacterial, and fungal cultures to exclude herpes simplex virus, varicella, pathogenic bacterial, and yeast infections.
  • Perform potassium hydroxide preparation to exclude candidiasis.
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Procedures

  • A skin biopsy is diagnostic but rarely is required for diagnosis.
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Histologic Findings

Histologic examination of macules reveals mild dermal edema with a sparse predominantly perivascular inflammatory infiltrate composed primarily of eosinophils, with small numbers of neutrophils and monocytes. Papules have increased edema and inflammatory infiltrate with involvement of the superficial portion of the pilosebaceous unit. Eosinophilic invasion of the outer root sheath of the hair follicle is noted. Pustules are subcorneal or intraepidermal and are found associated with the pilosebaceous orifice. A variable infiltrate of eosinophils and monocytes may be seen with or without neutrophils in the surrounding dermis.[21, 22, 23]

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Contributor Information and Disclosures
Author

Neil F Gibbs, MD  Voluntary Associate Professor, Departments of Pediatrics and Medicine, University of California, San Diego School of Medicine; Program Director, Pediatric Dermatologist, Department of Dermatology, Naval Medical Center, San Diego

Neil F Gibbs, MD is a member of the following medical societies: American Academy of Dermatology, Association of Military Dermatologists, and Society for Pediatric Dermatology

Disclosure: Nothing to disclose.

Coauthor(s)

Robert Huff, MD, Dermatology, Inc 

Robert Huff, MD, Dermatology, Inc is a member of the following medical societies: American Academy of Dermatology and Phi Beta Kappa

Disclosure: Nothing to disclose.

Eleanor E Sahn, MD  Director, Division of Pediatric Dermatology, Associate Professor, Departments of Dermatology and Pediatrics, Medical University of South Carolina

Eleanor E Sahn, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, and Southern Medical Association

Disclosure: Nothing to disclose.

Trisha C Beute, MD  Staff Physician, Department of Dermatology, Naval Medical Center, Portsmouth

Trisha C Beute, MD is a member of the following medical societies: Alpha Omega Alpha and American Academy of Dermatology

Disclosure: Nothing to disclose.

Specialty Editor Board

Eleanor E Sahn, MD  Director, Division of Pediatric Dermatology, Associate Professor, Departments of Dermatology and Pediatrics, Medical University of South Carolina

Eleanor E Sahn, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, and Southern Medical Association

Disclosure: Nothing to disclose.

Michael J Wells, MD  Associate Professor, Department of Dermatology, Texas Tech University Health Sciences Center, Paul L Foster School of Medicine

Michael J Wells, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American Medical Association, and Texas Medical Association

Disclosure: Nothing to disclose.

Van Perry, MD  Assistant Professor, Department of Medicine, Division of Dermatology, University of Texas School of Medicine at San Antonio

Van Perry, MD is a member of the following medical societies: American Academy of Dermatology and American Society for Laser Medicine and Surgery

Disclosure: Nothing to disclose.

Joel M Gelfand, MD, MSCE  Medical Director, Clinical Studies Unit, Assistant Professor, Department of Dermatology, Associate Scholar, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania

Joel M Gelfand, MD, MSCE is a member of the following medical societies: Society for Investigative Dermatology

Disclosure: AMGEN Consulting fee Consulting; AMGEN Grant/research funds Investigator; Genentech Grant/research funds investigator; Centocor Consulting fee Consulting; Abbott Grant/research funds investigator; Abbott Consulting fee Consulting; Novartis investigator; Pfizer Grant/research funds investigator; Celgene Consulting fee DMC Chair; NIAMS and NHLBI Grant/research funds investigator

Chief Editor

Dirk M Elston, MD  Director, Ackerman Academy of Dermatopathology, New York

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

Additional Contributors

The authors and editors of eMedicine gratefully acknowledge the contributions of previous Chief Editor, William D. James, MD, to the development and writing of this article.

References

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  2. Marchini G, Hultenby K, Nelson A, et al. Increased expression of HMGB-1 in the skin lesions of erythema toxicum. Pediatr Dermatol. Sep-Oct 2007;24(5):474-82. [Medline].

  3. Marchini G, Lindow S, Brismar H, et al. The newborn infant is protected by an innate antimicrobial barrier: peptide antibiotics are present in the skin and vernix caseosa. Br J Dermatol. Dec 2002;147(6):1127-34. [Medline].

  4. Marchini G, Stabi B, Kankes K, Lonne-Rahm S, Ostergaard M, Nielsen S. AQP1 and AQP3, psoriasin, and nitric oxide synthases 1-3 are inflammatory mediators in erythema toxicum neonatorum. Pediatr Dermatol. Sep-Oct 2003;20(5):377-84. [Medline].

  5. Nelson A, Ulfgren AK, Edner J, Stabi B, Brismar H, Hultenby K. Urticaria Neonatorum: accumulation of tryptase-expressing mast cells in the skin lesions of newborns with Erythema Toxicum. Pediatr Allergy Immunol. Dec 2007;18(8):652-8. [Medline].

  6. Carr JA, Hodgman JE, Freedman RI, Levan NE. Relationship between toxic erythema and infant maturity. Am J Dis Child. Aug 1966;112(2):129-34. [Medline].

  7. Singh M, Arora NK, Sroa HS. Urticaria neonatorum--an earliest marker of atopy. Indian J Med Res. Feb 1980;71:273-7. [Medline].

  8. Liu C, Feng J, Qu R, et al. Epidemiologic study of the predisposing factors in erythema toxicum neonatorum. Dermatology. 2005;210(4):269-72. [Medline].

  9. Levy HL, Cothran F. Erythema toxicum neonatorum present at birth. Am J Dis Child. Apr 1962;103:617-9. [Medline].

  10. Marino LJ. Toxic erythema present at birth. Arch Dermatol. Oct 1965;92(4):402-3. [Medline].

  11. Akoglu G, Ersoy Evans S, Akca T, Sahin S. An unusual presentation of erythema toxicum neonatorum: delayed onset in a preterm infant. Pediatr Dermatol. May-Jun 2006;23(3):301-2. [Medline].

  12. Chang MW, Jiang SB, Orlow SJ. Atypical erythema toxicum neonatorum of delayed onset in a term infant. Pediatr Dermatol. Mar-Apr 1999;16(2):137-41. [Medline].

  13. Monteagudo B, Labandeira J, Cabanillas M, Acevedo A, Toribio J. Prospective Study of Erythema Toxicum Neonatorum: Epidemiology and Predisposing Factors. Pediatr Dermatol. Nov 8 2011;[Medline].

  14. Maffei FA, Michaels MG, Wald ER. An unusual presentation of erythema toxicum scrotal pustules present at birth. Arch Pediatr Adolesc Med. Jun 1996;150(6):649-50. [Medline].

  15. Marchini G, Nelson A, Edner J, Lonne-Rahm S, Stavreus-Evers A, Hultenby K. Erythema toxicum neonatorum is an innate immune response to commensal microbes penetrated into the skin of the newborn infant. Pediatr Res. Sep 2005;58(3):613-6. [Medline].

  16. Keitel HG, Yadav V. Etiology of toxic erythema. Erythema toxicum neonatorum. Am J Dis Child. Sep 1963;106:306-9. [Medline].

  17. Bassukas ID. Is erythema toxicum neonatorum a mild self-limited acute cutaneous graft-versus-host-reaction from maternal-to-fetal lymphocyte transfer?. Med Hypotheses. Aug 1992;38(4):334-8. [Medline].

  18. Droitcourt C, Khosrotehran K, Halaby E, Aractingi S. Maternal cells are not responsible [corrected] for erythema toxicum neonatorum [corrected]. Pediatr Dermatol. May-Jun 2008;25(3):411-3. [Medline].

  19. Ferrandiz C, Coroleu W, Ribera M, Lorenzo JC, Natal A. Sterile transient neonatal pustulosis is a precocious form of erythema toxicum neonatorum. Dermatology. 1992;185(1):18-22. [Medline].

  20. Van Praag MC, Van Rooij RW, Folkers E, Spritzer R, Menke HE, Oranje AP. Diagnosis and treatment of pustular disorders in the neonate. Pediatr Dermatol. Mar-Apr 1997;14(2):131-43. [Medline].

  21. Freeman RG, Spiller R, Knox JM. Histopathology of erythema toxicum neonatorum. Arch Dermatol. Oct 1960;82:586-9. [Medline].

  22. Luders D. Histologic observations in erythema toxicum neonatorum. Pediatrics. Aug 1960;26:219-24. [Medline].

  23. Marchini G, Ulfgren AK, Lore K, Stabi B, Berggren V, Lonne-Rahm S. Erythema toxicum neonatorum: an immunohistochemical analysis. Pediatr Dermatol. May-Jun 2001;18(3):177-87. [Medline].

 
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