|Classification and external resources|
Erythema marginatum is a type of erythema (redness of the skin or mucous membranes) involving pink rings on the torso and inner surfaces of the limbs which come and go for as long as several months. It is found primarily on extensor surfaces.
The rings are barely raised and are non-itchy. The face is generally spared.
It occurs in less than 5% of patients with rheumatic fever, but is considered a major Jones criterion when it does occur. The four other major criteria include carditis, polyarthritis, Sydenham's Chorea, and subcutaneous nodules. In this case, it is often associated with Group A streptococcal infection, otherwise known as Streptococcus pyogenes infection, which can be detected with an ASO titer.
It is an early feature of rheumatic fever and not pathognomonic of it. It may be associated with mild myocarditis (inflammation of heart muscle). It is also seen in conditions like allergic drug reactions, sepsis and glomerulonephritis.
It often occurs as a harbinger of attacks in hereditary angioedema. In this case it may occur several hours or up to a day before an attack.
Some sources distinguish between the following:
- "Erythema marginatum rheumaticum"
- "Erythema marginatum perstans"
- Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. p. 281. ISBN 1-4160-2999-0.
- "erythema marginatum" at Dorland's Medical Dictionary
- Starr JC, Brasher GW, Rao A, Posey D (October 2004). "Erythema marginatum and hereditary angioedema". South. Med. J. 97 (10): 948–50. PMID 15558919. doi:10.1097/01.SMJ.0000140850.22535.FA.
- Erythema Marginatum Pictorial CME