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Erythema induratum, a form of lobular panniculitis
SpecialtyRheumatology Edit this on Wikidata

Panniculitis is a group of diseases whose hallmark is inflammation of subcutaneous adipose tissue (the fatty layer under the skin – panniculus adiposus).[1] Symptoms include tender skin nodules, and systemic signs such as weight loss and fatigue.

Restated, an inflammatory disorder primarily localized in the subcutaneous fat is termed a "panniculitis", a group of disorders that may be challenging both for the clinician and the dermatopathologist.[2]: 487  The general term for inflammation of any adipose tissue is steatitis.

Signs and symptoms[edit]

Panniculitis can also be classified based on the presence or absence of systemic symptoms. Panniculitis without systemic disease can be a result of trauma or cold.[3] Panniculitis with systemic disease can be caused by[citation needed]:

This is not a complete list of possible causes.

Associated conditions[edit]

Lipoatrophy or lipodystrophy (the loss of subcutaneous adipose tissue) can occur in any of these conditions.[citation needed]



It can occur in any fatty tissue (cutaneous or visceral) and is often diagnosed on the basis of a deep skin biopsy, and can be further classified by histological characteristics based on the location of the inflammatory cells (within fatty lobules or in the septa which separate them) and on the presence or absence of vasculitis.[citation needed]

There are thus four main histological subtypes:[4]

  1. lobular panniculitis without vasculitis (acute panniculitis, previously termed Weber–Christian disease,[5] systemic nodular panniculitis)
  2. lobular panniculitis with vasculitis
  3. septal panniculitis without vasculitis
  4. septal panniculitis with vasculitis


With vasculitis[edit]

Erythema induratum, or "Bazin disease", is a panniculitis on the back of the calves.[6] It was formerly thought to be a reaction to the tuberculum bacillus. It is now considered a panniculitis that is not associated with a single defined pathogen.[7]

Nodular vasculitis is a skin condition characterized by small, tender, reddened nodules on the legs, mostly on the calves and shins. Microscopically there are epithelioid granulomas and vasculitis in the subcutaneous tissue, making it a form of panniculitis. Most of these cases are now thought to be manifestation of tuberculosis and indeed they respond well to anti-tuberculous treatment.[citation needed]

Without vasculitis[edit]

Non-vasculitis forms of panniculitis that may occur include:

  • Cytophagic histiocytic panniculitis was first described in 1980 by Winkelmann as a chronic histiocytic disease of the subcutaneous adipose tissue, which is characterized clinically by tender erythematous nodules, recurrent high fever, malaise, jaundice, organomegaly, serosal effusions, pancytopenia, hepatic dysfunction and coagulation abnormalities.[2]: 494 [8] CHP may occur either isolated or as part of cutaneous manifestations of hemophagocytic syndrome (HPS).[9] CHP is a rare and often fatal form of panniculitis with multisystem involvement. But it can also present in a benign form involving only the subcutaneous tissue, thus having a broad clinical spectrum.
  • Traumatic panniculitis is a panniculitis that occurs following trauma to the skin.[2]: 492 [10]
  • Cold panniculitis is a panniculitis occurring after exposure to cold, most often seen in infants and young children.[2]: 491  This condition has been described in children who suck ice or popsicles, and therefore is sometimes referred to as "popsicle panniculitis."[2]: 491 [10] The term was coined when a patient with a rash of unknown origin on her cheek was taken to a dermatologist.[11]
  • Gouty panniculitis is a panniculitis caused by deposition of uric acid crystals in gout.[2]: 494 
  • Pancreatic panniculitis (also known as enzymatic panniculitis, Pancreatic fat necrosis,[10] and subcutaneous fat necrosis) is a panniculitis most commonly associated with pancreatic carcinoma, and more rarely with anatomic pancreatic abnormalities, pseudocysts, or drug-induced pancreatitis.[2]: 493 
  • Factitial panniculitis is a panniculitis that may be induced by the injection of organic materials, povidone, feces, saliva, vaginal fluid, and oils.[2]: 492 

With needle-shaped clefts[edit]

Lipodermatosclerosis is a form of panniculitis associated with chronic venous insufficiency that presents with brown indurations on the front of the shins. It may be associated with pain and other signs of chronic venous insufficiency. The exact cause is unknown.[12]

Other forms include:


Erythema nodosum[edit]

Erythema nodosum is a form of panniculitis characterised by tender red nodules, 1–10 cm, associated with systemic symptoms including fever, malaise, and joint pain. Nodules may become bluish-purple, yellowing, and green, and subside over a period of 2–6 weeks without ulcerating or scarring. Erythema nodosum is associated with infections, including Hepatitis C, EBV and tuberculosis, Crohn's disease and sarcoidosis, pregnancy, medications including sulfonamides, and some cancers, including Non-Hodgkin lymphoma and pancreatic cancer.[15]


Alpha-1 antitrypsin deficiency panniculitis[13] is a panniculitis associated with a deficiency of the α1-antitrypsin enzyme inhibitor.[2]: 494 


See also[edit]


  1. ^ "panniculitis" at Dorland's Medical Dictionary
  2. ^ a b c d e f g h i j k l m James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 978-0-7216-2921-6.
  3. ^ "eMedicine - Cold Panniculitis: Article by Geromanta Baleviciene". Retrieved 2008-03-25.
  4. ^ "Panniculitis. DermNet NZ". Retrieved 2010-05-17.
  5. ^ "eMedicine - Weber-Christian Disease: Article by Moise L Levy". Retrieved 2008-03-25.
  6. ^ "erythema induratum" at Dorland's Medical Dictionary[dead link]
  7. ^ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. p. 1265. ISBN 978-0-7216-0187-8.
  8. ^ Winkelmann RK, Bowie EJ. Hemorrhagic diathesis associated with benign histiocytic cytophagic panniculitis and systemic histiocytosis. Arch Intern Med.1980; 140: 1460-3
  9. ^ Smith K J, Skeleton H J, Yeagre J, Angritt P, Wagner K, James W. D., Giblin W. J., Lupton G. P. Cutaneous histopathological, immunohistochemical, and clinical manifestations inpatients with hemophagocytic syndrome. Military Medical old Consortium for Applied Retroviral Research (MMCARR). Arch Dermatol 1992; 128: 193-200
  10. ^ a b c Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. p. 1515. ISBN 978-1-4160-2999-1.
  11. ^ Epstein, Ervin and Oren, Mark, "Popsicle Panniculitis" "The New England Journal of Medicine", 282 (17) : 966-67, 1970
  12. ^ Bruce AJ. et al., Lipodermatosclerosis: Review of cases evaluated at Mayo Clinic. J Am Acad Dermatol. 2002.
  13. ^ a b Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.
  14. ^ Garg, Taru; Ahmed, Riaz; Bharadwaj, Apoorva V.; Shukla, Shailaja (April 2022). "Poststeroid panniculitis – A rare case report". Indian Journal of Paediatric Dermatology. 23 (2): 165. doi:10.4103/ijpd.ijpd_116_21.
  15. ^ Gilchrist, H; Patterson, JW (Jul–Aug 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.

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