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Erythema marginatum rheumatica is a rash that is associated with acute rheumatic fever. Rheumatic fever is a multisystem disease that occurs after infection with a Lancefield group A streptococcus.
The term erythema annulare is sometimes used for erythema marginatum but erythema annulare centrifugum is classified as one of the figurate or gyrate erythemas. It may be due to a hypersensitivity, to malignancy, infection, drugs, or chemicals, or it may be idiopathic. Erythema marginatum is really, by definition, associated with rheumatic fever.
In developed countries, rheumatic fever has become very rare and this rash occurs in fewer than 5% of cases of rheumatic fever. However, rheumatic fever incidence in New Zealand has failed to decrease since the 1980s and remains one of the highest reported in a developed country, especially amongst Maori children.
One of the best descriptions of erythema marginatum was given by Professor Perry of Bristol. It was based on a case series published in Archives of Disease in Childhood. This is detailed below, under 'Further reading & references'..
Characteristically the eruption starts as a solid erythema, little, if at all, raised. It gradually spreads out and, as it does so, the skin in the centre of lesions returns to normal, thus forming the typical spreading marginate or annular eruption. Where the spreading circles of the rash meet they coalesce forming a larger ring. The usual sites of its occurence are on the front of the abdomen and front and back of the chest. It can develop on the limbs but almost never on the face. It may, and usually does, appear at the onset of an acute attack or relapse of rheumatism but it is frequently present when there are no other signs of active infection and the ESR is normal. Once it has occurred it tends to come and go lasting from one or two days to months or years.
It may appear with subcutaneous nodules which are firm, painless lumps, mainly on the hands, feet, occiput and back. They are usually 0.5 to 2 cm in diameter and often found in crops of about three, appearing two to three weeks after the onset of fever. The rash occurs early in the disease and remains long past the resolution of other symptoms.
Although uncommon, it continues to be reported and a recent case report describes its occurence in a case of rheumatic chorea..
Consider drug reactions. It may look like urticaria that can also change quite rapidly but in erythema marginatum there is no pruritus.
Erythema marginatum is also recognised as the classical skin finding in hereditary angio-oedema.
Diagnosis is based on presence of additional clinical features suggestive of acute rheumatic fever, using modified Jones' criteria.
Evidence of streptococcal infection is the essential criterion and this can be established by:
- Throat swab which grows Group A beta-haemolytic streptococcus.
- Raised or increasing streptococcal antibody titre.
In uncertain cases, skin biopsy may allow early diagnosis.
It may be associated with carditis, arthritis, fever and Sydenham's chorea.
There is no specific management of the rash but rheumatic fever must be treated as described in the Rheumatic Fever article. If the diagnosis is suspected, it is wise to start a full course of penicillin as for rheumatic fever.
There are no specific complications of the rash but complications such as cardiac disease and Sydenham's chorea may occur as a result of the rheumatic fever.
As for rheumatic fever.
As for rheumatic fever.
Further reading and references
Jones TD; Diagnosis of rheumatic fever. JAMA 1944 126: 481-85
No authors listed; Guidelines for the diagnosis of rheumatic fever. Jones Criteria, 1992 update. Special Writing Group of the Committee on Rheumatic Fever, Endocarditis, and Kawasaki Disease of the Council on Cardiovascular Disease in the Young of the American Heart Association. JAMA. 1992 Oct 21268(15):2069-73.
Jaine R, Baker M, Venugopal K; Epidemiology of acute rheumatic fever in New Zealand 1996-2005. J Paediatr Child Health. 2008 Oct44(10):564-71. doi: 10.1111/j.1440-1754.2008.01384.x.
Congeni BL; The resurgence of acute rheumatic fever in the United States. Pediatr Ann. 1992 Dec21(12):816-20.
Zomorrodi A, Wald ER; Sydenham's chorea in western Pennsylvania. Pediatrics. 2006 Apr117(4):e675-9. Epub 2006 Mar 13.
Perry CB; Erythema marginatum (rheumaticum). Arch Dis Child. 1937 Aug12(70):233-8.
Erythema marginatum; Medical Pictures
Images in paediatrics: Acute rheumatic fever with chorea; Arch Dis Child 201398:203 doi:10.1136/archdischild-2012-302732
Bygum A; Hereditary angio-oedema in Denmark: a nationwide survey. Br J Dermatol. 2009 Nov161(5):1153-8. doi: 10.1111/j.1365-2133.2009.09366.x. Epub 2009 Jun 22.
Troyer C, Grossman ME, Silvers DN; Erythema marginatum in rheumatic fever: early diagnosis by skin biopsy. J Am Acad Dermatol. 1983 May8(5):724-8.