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Erythema nodosum

Last reviewed: 21 Oct 2024
Last updated: 30 Jul 2021

Summary

Definition

History and exam

Key diagnostic factors

  • nodules on shins
  • uveitis, red eyes, retinal nodules, or candle-wax drippings
  • nodules on other skin areas
  • anesthetic skin lesions
Full details

Other diagnostic factors

  • joint pains
  • fever
  • diarrhea, constipation, abdominal pain, hematochezia
  • enlarged spleen
  • miliary nodules on the retina
Full details

Risk factors

  • streptococcal infection
  • sarcoidosis
  • tuberculosis
  • coccidioidomycosis
  • histoplasmosis
  • blastomycosis
  • brucellosis
  • Behcet disease
  • oral contraceptives
  • sulfonamides
  • iodides and antiepileptic drugs
  • psittacosis
  • leprosy
  • inflammatory bowel disease
  • pregnancy
  • malignancy
Full details

Diagnostic tests

1st tests to order

  • CBC
  • antistreptolysin-O titer
  • chest x-ray
  • tuberculin skin test, interferon gamma release assay
Full details

Tests to consider

  • serum ACE level
  • skin lesion biopsy
  • coccidioidin skin test
  • histoplasmin skin test
  • lepromin skin test
  • blastomycosis serology
  • brucellosis serology
  • psittacosis serology
  • x-ray symptomatic joints
  • rheumatoid factor testing
  • Yersinia agglutination titer
  • Yersinia stool cultures
  • colonoscopy
  • serum IgD
  • deep punch biopsies including subcutaneous fat, or incisional biopsies
Full details

Treatment algorithm

ACUTE

mild to moderately severe symptoms

severe refractory symptoms

Contributors

Authors

Daniela Kroshinsky, MD, MPH
Daniela Kroshinsky

Associate Professor of Dermatology

Harvard Medical School

Director of Pediatric Dermatology

Director of Inpatient Dermatology

Massachusetts General Hospital

Boston

MA

Disclosures

DK declares that she has no competing interests.

Acknowledgements

Dr Daniela Kroshinsky would like to gratefully acknowledge Dr Om P. Sharma, a previous contributor to this topic. Dr Kroshinsky would also like to thank Priyanka Vedak for her contribution to this topic. We would like to gratefully acknowledge the contribution of the late Elisabeth Higgins (Consultant Dermatologist, King’s College Hospital) for her peer review of this topic.

Disclosures

OPS declared that he had no competing interests. PV declared that she had no competing interests. EH declared that she had no competing interests.

Peer reviewers

Robert T. Brodell, MD

Professor of Internal Medicine

Clinical Professor of Dermatopathology

Northeastern Ohio Universities College of Medicine

Warren

Associate Clinical Professor of Dermatology

Case Western Reserve University School of Medicine

Cleveland

OH

Disclosures

RTB declares that he has no competing interests.

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