Erythema nodosum

Other names: Subacute migratory panniculitis of Vilanova and Piñol
Erythema nodosum in a person who had recently had salmonella
Specialty| Dermatology, rheumatology
Symptoms| Tender red lumps within the skin of both shins[1]
Usual onset| 20 to 40 years[1][2]
Duration| Up to six weeks[1]
Causes| Unclear, strep throat, tuberculosis, inflammatory bowel disease, cancer, sarcoidosis, certain medications[1][2]
Diagnostic method| Symptoms and examination[2]
Differential diagnosis| Lupus, α1-antitrypsin deficiency, scleroderma[1]
Treatment| Rest, NSAIDs[1][2]
Prognosis| Good[2]
Frequency| 1 in 20,000 to 100,000 people[1]

Erythema nodosum (EN), is an inflammatory condition that involves fat cells under the skin.[1] The main symptom is tender red nodules or lumps within the skin of both shins.[1] These lumps are generally 1 to 10 cm in width.[1] Other symptoms may include joint pain and a slight fever.[1] Scarring or skin breakdown does not occur.[1]

The cause is frequently unclear.[1] Occasionally it may occur due to a variety of causes including strep throat, tuberculosis, inflammatory bowel disease, cancer, sarcoidosis, and certain medications.[1][2] The underlying mechanism involves a hypersensitivity reaction to an antigen.[2] Diagnosis can often be made based on symptoms and examination, though it may be confirmed by biopsy in cases that are unclear.[2] It may appear similar to insect bites, vasculitis, scleroderma, Weber-Christian disease, pancreatitis associated fat necrosis, necrobiosis lipoidica, and subcutaneous granuloma.[3]

Treatment generally is supportive care including rest and the use of NSAIDs.[1][2] Underlying conditions may need to be addressed.[1] Each lesion may last for two weeks with an attack lasting for up to six weeks.[1] About 1 in 20,000 to 100,000 people are affected.[1] Females are affected six time more frequently than males.[1] It is most common in the 20 to 40 year age group.[1][2] It was first described in English in 1807 by Robert Willan.[4]

## Contents

* 1 Signs and symptoms
* 1.1 Pre-eruptive phase
* 1.2 Eruptive stage
* 2 Causes
* 3 Pathophysiology
* 4 Diagnosis
* 5 Treatment
* 6 Epidemiology
* 7 Name
* 8 References
* 9 External links

## Signs and symptoms[edit | edit source]

Diagram showing erythema nodosum

### Pre-eruptive phase[edit | edit source]

The first signs of erythema nodosum are often flu-like symptoms such as a fever, cough, malaise, and aching joints. Some people also experience stiffness or swelling in the joints and weight loss.[5]

### Eruptive stage[edit | edit source]

Erythema nodosum is characterised by 1–2-inch (25–51 mm) nodules (rounded lumps) below the skin surface, usually on the shins. These subcutaneous nodules can appear anywhere on the body, but the most common sites are the shins, arms, thighs, and torso. Each nodule typically disappears after around two weeks, though new ones may continue to form for up to six or eight weeks.[5] A new nodule usually appears red and is hot and firm to the touch. The redness starts to fade and it gradually becomes softer and smaller until it disappears. Each nodule usually heals completely without scarring over the course of about two weeks.[5][6] Joint pain and inflammation sometimes continue for several weeks or months after the nodules appear.[7]

Less common variants of erythema nodosum include:

* Ulcerating forms, seen in Crohn's disease
* Erythema contusiforme, when a subcutaneous hemorrhage (bleeding under the skin) occurs with an erythema nodosum lesion, causing the lesion to look like a contusion (bruise)
* Erythema nodosum migrans (also known as subacute nodular migratory panniculitis), a rare form of chronic erythema nodosum characterized by asymmetrical nodules that are mildly tender and migrate over time.[8][9][10]

* Erythema nodosum lesion in a person with tuberculosis

* A single lesion of erythema nodosum

* Erythema nodosum in rather dark skin

* Erythema nodosum in a person who had recently had streptococcal pharyngitis

## Causes[edit | edit source]

EN is associated with a wide variety of conditions, including:

Unknown

In about 30–50% of cases, the cause of EN is unknown.[11]

Infection[7]

* Streptococcal infection which, in children, is by far the most common precipitant,[10]
* Primary infection of Tuberculosis
* Mycoplasma pneumoniae
* Histoplasma capsulatum
* Yersinia
* Epstein-Barr virus
* Coccidioides immitis (Valley fever)
* Cat scratch disease

Autoimmune disorders, including[8]

* Inflammatory bowel disease (IBD): about 15% of patients develop erythema nodosum.[12]
* Behçet's disease
* Sarcoidosis

Pregnancy[8]
Medications, including[8][11][13]

* Sulfonamides
* Penicillins
* Bromides
* Hepatitis B vaccination[14]

Cancer, including[8]

* Non-Hodgkin's lymphoma (NHL)
* Carcinoid tumours
* Pancreatic cancer

EN may also be due to excessive antibody production in lepromatous leprosy leading to deposition of immune complexes.[15]

There is an association with the HLA-B27 histocompatibility antigen, which is present in 65% of patients with erythema nodosum.[16]

A useful mnemonic for causes is SORE SHINS (Streptococci, OCP, Rickettsia, Eponymous (Behçet), Sulfonamides, Hansen's Disease (Leprosy), IBD, NHL, Sarcoidosis.[17]

## Pathophysiology[edit | edit source]

Erythema nodosum is probably a delayed hypersensitivity reaction to a variety of antigens. Although circulating immune complexes have been demonstrated in patients with inflammatory bowel disease, they have not been found in idiopathic or uncomplicated cases.[18]

## Diagnosis[edit | edit source]

Erythema nodosum is diagnosed clinically. A biopsy can be taken and examined microscopically to confirm an uncertain diagnosis.[6] Microscopic examination usually reveals a neutrophilic infiltrate surrounding capillaries that results in septal thickening, with fibrotic changes in the fat around blood vessels. A characteristic microscopic finding is radial granulomas, well-defined nodular aggregates of histiocytes surrounding a stellate cleft.[7]

Additional evaluation should be performed to determine the underlying cause of erythema nodosum. This may include a full blood count, erythrocyte sedimentation rate (ESR), antistreptolysin-O (ASO) titer and throat culture, urinalysis, intradermal tuberculin test, and a chest x-ray.[19] The ESR is typically high, the C-reactive protein elevated, and the blood showing an increase in white blood cells.[6]

The ESR is initially very high and falls as the nodules of erythema nodosum. The ASO titer is high in cases associated with a streptococcal throat infection. A chest X-ray should be performed to rule out pulmonary diseases, in particular sarcoidosis and Löfgren syndrome.[6]

## Treatment[edit | edit source]

Erythema nodosum is self-limiting and usually resolves itself within 3–6 weeks. A recurring form does exist, and in children, it is attributed to repeated infections with streptococcus.[15] Treatment should focus on the underlying cause. Symptoms can be treated with bed rest, leg elevation, compressive bandages, wet dressings, and nonsteroidal anti-inflammatory agents (NSAIDs).[7] NSAIDs are usually more effective at the onset of EN versus with chronic disease.

Potassium iodide can be used for persistent lesions whose cause remains unknown. Corticosteroids and colchicine can be used in severe refractory cases.[20][21] Thalidomide has been used successfully in the treatment of Erythema nodosum leprosum,[22] and it was approved by the U.S. FDA for this use in July 1998.[23] According to a 2009 meta-analysis, there is some evidence of benefit for both thalidomide and clofazimine in the treatment of erythema nodosum leprosum.[24]

## Epidemiology[edit | edit source]

Erythema nodosum is the most common form of panniculitis. It is most common in the ages of 20–30, and affects women 3–6 times more than men.[6]

## Name[edit | edit source]

The term, Subacute Migratory Panniculitis of Vilanova and Piñol, was named after the two famous Catalan dermatologists who provided a brief description and explanation of the disease, Drs. Xavier Montiu Vilanova (1902-1965) and Joaquin Aguade Piñol (1918-1977), in 1954, and was named in 1956.[25][26]

## References[edit | edit source]

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 Schwartz, RA; Nervi, SJ (1 March 2007). "Erythema nodosum: a sign of systemic disease". American family physician. 75 (5): 695–700. PMID 17375516.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Hafsi, W; Badri, T (January 2020). "Erythema Nodosum". PMID 29262192. `{{cite journal}}`: Cite journal requires `|journal=` (help)
3. ↑ Ferri, Fred F. (2024). "Erythema nodosum". Ferri's Clinical Advisor 2024. Philadelphia: Elsevier. p. 556.e7. ISBN 978-0-323-75576-4. Archived from the original on 2024-05-03. Retrieved 2024-05-02.
4. ↑ Callen, Jeffrey P.; Jorizzo, Joseph L.; Bolognia, Jean L.; Piette, Warren; Zone, John J. (2009). Dermatological Signs of Internal Disease E-Book: Expert Consult - Online and Print. Elsevier Health Sciences. p. 69\. ISBN 978-1-4377-1130-1. Archived from the original on 2021-08-29. Retrieved 2020-11-13.
5. ↑ 5.0 5.1 5.2 "Information for Families Erythema nodosum". Great Ormond Street Hospital for Children NHS Foundation Trust. GOSH NHS Foundation Trust. April 2012. Ref: 2012F1224. Archived from the original on 2017-04-19. Retrieved 2017-04-19.
6. ↑ 6.0 6.1 6.2 6.3 6.4 Fitzpatrick, Thomas B. (2005). Fitzpatrick's color atlas and synopsis of clinical dermatology (5th ed.). New York: McGraw-Hill. p. 148\. ISBN 978-0-07-144019-6.
7. ↑ 7.0 7.1 7.2 7.3 Schwartz, R. A.; Nervi, S. J. (2007). "Erythema nodosum: A sign of systemic disease". American Family Physician. 75 (5): 695–700. PMID 17375516.
8. ↑ 8.0 8.1 8.2 8.3 8.4 Gilchrist, Heidi; Patterson, James W. (2010). "Erythema nodosum and erythema induratum (nodular vasculitis): Diagnosis and management". Dermatologic Therapy. 23 (4): 320–7. doi:10.1111/j.1529-8019.2010.01332.x. PMID 20666819. S2CID 39695627.
9. ↑ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.[page needed]
10. ↑ 10.0 10.1 William D. James; Timothy G. Berger; Dirk M. Elston (2011). Andrews' Diseases of the skin : clinical dermatology (11th ed.). [London]: Saunders/ Elsevier. p. 488\. ISBN 978-1-4377-0314-6.
11. ↑ 11.0 11.1 Mert, Ali; Ozaras, Resat; Tabak, Fehmi; Pekmezci, Salih; Demirkesen, Cuyan; Ozturk, Recep (2009). "Erythema Nodosum: An Experience of 10 Years". Scandinavian Journal of Infectious Diseases. 36 (6–7): 424–7. doi:10.1080/00365540410027184. PMID 15307561. S2CID 13123205.
12. ↑ Goldman, Lee (2012). Goldman's Cecil Medicine (24th ed.). Philadelphia: Elsevier Saunders. p. 915\. ISBN 978-1-4377-2788-3.
13. ↑ Bohn, S; Büchner, S; Itin, P (1997). "Erythema nodosum: 112 cases. Epidemiology, clinical aspects and histopathology". Schweizerische Medizinische Wochenschrift. 127 (27–28): 1168–76. PMID 9324739.
14. ↑ Rogerson, S J; Nye, F J (1990). "Hepatitis B vaccine associated with erythema nodosum and polyarthritis". BMJ. 301 (6747): 345. doi:10.1136/bmj.301.6747.345. PMC 1663612. PMID 2144199.
15. ↑ 15.0 15.1 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon C. (2009). Robbins and Coltran Pathological Basis of Disease. pp. 372–3. ISBN 978-1-4160-4930-2.
16. ↑ Cunha, Burke A. (1999). Infectious disease pearls. Philadelphia: Hanley & Belfus. p. 105\. ISBN 978-1-56053-203-3.
17. ↑ Dr Kevin McCarthy, Cork, Ireland or DIPOUT: Drugs (e.g. sulfonamides), Infections (e.g. strep), Pregnancy, OCP, Ulcerative colitis, TB[full citation needed]
18. ↑ Nguyen, Geoffrey C.; Torres, Esther A.; Regueiro, Miguel; Bromfield, Gillian; Bitton, Alain; Stempak, Joanne; Dassopoulos, Themistocles; Schumm, Philip; Gregory, Federico J.; Griffiths, Anne M.; Hanauer, Stephen B.; Hanson, Jennifer; Harris, Mary L.; Kane, Sunanda V.; Orkwis, Heather Kiraly; Lahaie, Raymond; Oliva-Hemker, Maria; Pare, Pierre; Wild, Gary E.; Rioux, John D.; Yang, Huiying; Duerr, Richard H.; Cho, Judy H.; Steinhart, A. Hillary; Brant, Steven R.; Silverberg, Mark S. (2006). "Inflammatory Bowel Disease Characteristics Among African Americans, Hispanics, and Non-Hispanic Whites: Characterization of a Large North American Cohort". The American Journal of Gastroenterology. 101 (5): 1012–23. PMID 16696785.
19. ↑ García-Porrúa, Carlos; González-Gay, Miguel A.; Vázquez-Caruncho, Manuel; López-Lazaro, Luis; Lueiro, Mercedes; Fernández, Maria L.; Alvarez-Ferreira, Javier; Pujol, Ramón M. (2000). "Erythema nodosum: Etiologic and predictive factors in a defined population". Arthritis & Rheumatism. 43 (3): 584–92. doi:10.1002/1529-0131(200003)43:3<584::AID-ANR15>3.0.CO;2-6. PMID 10728752.
20. ↑ Mat, C.; Yurdakul, S; Uysal, S; Gogus, F; Ozyazgan, Y; Uysal, O; Fresko, I; Yazici, H (2005). "A double-blind trial of depot corticosteroids in Behcet's syndrome". Rheumatology. 45 (3): 348–52. doi:10.1093/rheumatology/kei165. PMID 16263779.
21. ↑ Yurdakul, Sebahattin; Mat, Cem; Tüzün, Yalçin; Özyazgan, Yilmaz; Hamuryudan, Vedat; Uysal, Ömer; Şenocak, Mustafa; Yazici, Hasan (2001). "A double-blind trial of colchicine in Behçet's syndrome". Arthritis & Rheumatism. 44 (11): 2686–92. doi:10.1002/1529-0131(200111)44:11<2686::AID-ART448>3.0.CO;2-H. PMID 11710724. S2CID 19523919.
22. ↑ Silverman, W. A. (2002). "The Schizophrenic Career of a 'Monster Drug'". Pediatrics. 110 (2): 404–6. doi:10.1542/peds.110.2.404. PMID 12165600.
23. ↑ Rouhi, Maureen (2005). "Thalidomide". Chemical & Engineering News Archive. 83 (25): 122. doi:10.1021/cen-v083n025.p122. Archived from the original on 2015-09-04. Retrieved 2010-02-13.
24. ↑ Van Veen, Natasja H. J.; Lockwood, Diana N. J.; van Brakel, Wim H.; Ramirez, Jose; Richardus, Jan Hendrik (2009-07-08). "Interventions for erythema nodosum leprosum". The Cochrane Database of Systematic Reviews (3): CD006949. doi:10.1002/14651858.CD006949.pub2. ISSN 1469-493X. PMID 19588412.
25. ↑ Subacute Nodular Migratory Panniculitis (Vilanova Disease) at eMedicine
26. ↑ Mascaró, J. M. (1978). "In memoriam Joaquin Piñol Aguadé, 1918--1977". Der Hautarzt; Zeitschrift für Dermatologie, Venerologie, und Verwandte Gebiete. 29 (11): 613–4. PMID 363649.

## External links[edit | edit source]

Classification|

* ICD-10: L52
* ICD-9-CM: 695.2, 017.1
* MeSH: D004893
* DiseasesDB: 4462

|

External resources|

* MedlinePlus: 000881
* eMedicine: derm/138

* v
* t
* e

Diseases of the skin and appendages by morphology

Growths|

| Epidermal|

* Wart
* Callus
* Seborrheic keratosis
* Acrochordon
* Molluscum contagiosum
* Actinic keratosis
* Squamous-cell carcinoma
* Basal-cell carcinoma
* Merkel-cell carcinoma
* Nevus sebaceous
* Trichoepithelioma

|

Pigmented|

* Freckles
* Lentigo
* Melasma
* Nevus
* Melanoma

Dermal and
subcutaneous|

* Epidermal inclusion cyst
* Hemangioma
* Dermatofibroma (benign fibrous histiocytoma)
* Keloid
* Lipoma
* Neurofibroma
* Xanthoma
* Kaposi's sarcoma
* Infantile digital fibromatosis
* Granular cell tumor
* Leiomyoma
* Lymphangioma circumscriptum
* Myxoid cyst

Rashes|

| With
epidermal
involvement|

| Eczematous|

* Contact dermatitis
* Atopic dermatitis
* Seborrheic dermatitis
* Stasis dermatitis
* Lichen simplex chronicus
* Darier's disease
* Glucagonoma syndrome
* Langerhans cell histiocytosis
* Lichen sclerosus
* Pemphigus foliaceus
* Wiskott–Aldrich syndrome
* Zinc deficiency

|

Scaling|

* Psoriasis
* Tinea (Corporis
* Cruris
* Pedis
* Manuum
* Faciei)
* Pityriasis rosea
* Secondary syphilis
* Mycosis fungoides
* Systemic lupus erythematosus
* Pityriasis rubra pilaris
* Parapsoriasis
* Ichthyosis

Blistering|

* Herpes simplex
* Herpes zoster
* Varicella
* Bullous impetigo
* Acute contact dermatitis
* Pemphigus vulgaris
* Bullous pemphigoid
* Dermatitis herpetiformis
* Porphyria cutanea tarda
* Epidermolysis bullosa simplex

Papular|

* Scabies
* Insect bite reactions
* Lichen planus
* Miliaria
* Keratosis pilaris
* Lichen spinulosus
* Transient acantholytic dermatosis
* Lichen nitidus
* Pityriasis lichenoides et varioliformis acuta

Pustular|

* Acne vulgaris
* Acne rosacea
* Folliculitis
* Impetigo
* Candidiasis
* Gonococcemia
* Dermatophyte
* Coccidioidomycosis
* Subcorneal pustular dermatosis

Hypopigmented|

* Tinea versicolor
* Vitiligo
* Pityriasis alba
* Postinflammatory hyperpigmentation
* Tuberous sclerosis
* Idiopathic guttate hypomelanosis
* Leprosy
* Hypopigmented mycosis fungoides

Without
epidermal
involvement|

| Red|

| Blanchable
Erythema|

| Generalized|

* Drug eruptions
* Viral exanthems
* Toxic erythema
* Systemic lupus erythematosus

|

Localized|

* Cellulitis
* Abscess
* Boil
* Erythema nodosum
* Carcinoid syndrome
* Fixed drug eruption

Specialized|

* Urticaria
* Erythema (Multiforme
* Migrans
* Gyratum repens
* Annulare centrifugum
* Ab igne)

Nonblanchable
Purpura|

| Macular|

* Thrombocytopenic purpura
* Actinic/solar purpura

|

Papular|

* Disseminated intravascular coagulation
* Vasculitis

Indurated|

* Scleroderma/morphea
* Granuloma annulare
* Lichen sclerosis et atrophicus
* Necrobiosis lipoidica

Miscellaneous
disorders|

| Ulcers|

|

Hair|

* Telogen effluvium
* Androgenic alopecia
* Alopecia areata
* Systemic lupus erythematosus
* Tinea capitis
* Loose anagen syndrome
* Lichen planopilaris
* Folliculitis decalvans
* Acne keloidalis nuchae

Nail|

* Onychomycosis
* Psoriasis
* Paronychia
* Ingrown nail

Mucous
membrane|

* Aphthous stomatitis
* Oral candidiasis
* Lichen planus
* Leukoplakia
* Pemphigus vulgaris
* Mucous membrane pemphigoid
* Cicatricial pemphigoid
* Herpesvirus
* Coxsackievirus
* Syphilis
* Systemic histoplasmosis
* Squamous-cell carcinoma

* v
* t
* e

Urticaria and erythema

Urticaria
(acute/chronic)|

| Allergic urticaria|

* Urticarial allergic eruption

|

Physical urticaria|

* Cold urticaria
* Familial
* Primary cold contact urticaria
* Secondary cold contact urticaria
* Reflex cold urticaria

* Heat urticaria
* Localized heat contact urticaria
* Solar urticaria

* Dermatographic urticaria
* Vibratory angioedema
* Pressure urticaria
* Cholinergic urticaria
* Aquagenic urticaria

Other urticaria|

* Acquired C1 esterase inhibitor deficiency
* Adrenergic urticaria
* Exercise urticaria
* Galvanic urticaria
* Schnitzler syndrome
* Urticaria-like follicular mucinosis

Angioedema|

* Episodic angioedema with eosinophilia
* Hereditary angioedema

Erythema|

| Erythema multiforme/
drug eruption|

* Erythema multiforme minor
* Erythema multiforme major
* Stevens–Johnson syndrome, Toxic epidermal necrolysis
* panniculitis (Erythema nodosum)
* Acute generalized exanthematous pustulosis

|

Figurate erythema|

* Erythema annulare centrifugum
* Erythema marginatum
* Erythema migrans
* Erythema gyratum repens

Other erythema|

* Necrolytic migratory erythema
* Erythema toxicum
* Erythroderma
* Palmar erythema
* Generalized erythema

* v
* t
* e

Disorders of subcutaneous fat

Panniculitis|

| Lobular|

* without vasculitis
* Cold
* Cytophagic histiocytic
* Factitial
* Gouty
* Pancreatic
* Traumatic

* needle-shaped clefts
* Subcutaneous fat necrosis of the newborn
* Sclerema neonatorum
* Post-steroid panniculitis
* Lipodermatosclerosis
* Weber–Christian disease
* Lupus erythematosus panniculitis
* Sclerosing lipogranuloma

* with vasculitis: Nodular vasculitis/Erythema induratum

|

Septal|

* without vasculitis: Alpha-1 antitrypsin deficiency panniculitis
* Erythema nodosum
* Acute
* Chronic

* with vasculitis: Superficial thrombophlebitis

Lipodystrophy|

| Acquired|

* generalized: Acquired generalized lipodystrophy

* partial: Acquired partial lipodystrophy
* Centrifugal abdominal lipodystrophy
* HIV-associated lipodystrophy
* Lipoatrophia annularis

* localized: Localized lipodystrophy

|

Congenital|

* Congenital generalized lipodystrophy
* Familial partial lipodystrophy
* Marfanoid–progeroid–lipodystrophy syndrome
* Poland syndrome

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