Erysipelas

Erysipelas is a relatively common bacterial infection of the superficial layer of the skin (upper dermis), extending to the superficial lymphatic vessels within the skin, characterized by a raised, well-defined, tender, bright red rash, typically on the face or legs, but which can occur anywhere on the skin. It is a form of cellulitis and is potentially serious.

Erysipelas is usually caused by the bacterium Streptococcus pyogenes, also known as group A β-hemolytic streptococci, which enters the body through a break in the skin, such as a scratch or an insect bite. It is more superficial than cellulitis and is typically more raised and demarcated. The term comes from the Greek ἐρυσίπελας (erysípelas), meaning red skin.

In animals erysipelas is a disease caused by infection with the bacterium Erysipelothrix rhusiopathiae. In animals it is called Diamond Skin Disease and occurs especially in pigs. Heart valves and skin are affected. Erysipelothrix rhusiopathiae can also infect humans but in that case the infection is known as erysipeloid and is an occupational skin disease.

Signs and symptoms
Symptoms often occur suddenly. Affected individuals may develop a fever, shivering, chills, fatigue, headaches and vomiting and be generally unwell within 48 hours of the initial infection. The red plaque enlarges rapidly and has a sharply demarcated, raised edge. It may appear swollen, feel firm, warm and tender to touch and have a consistency similar to orange peel. Pain may be extreme.

More severe infections can result in vesicles (pox or insect bite-like marks), blisters, and petechiae (small purple or red spots), with possible skin necrosis (death). Lymph nodes may be swollen and lymphedema may occur. Occasionally a red streak extending to the lymph node can be seen.

The infection may occur on any part of the skin, including the face, arms, fingers, legs and toes; it tends to favour the extremities. The umbilical stump and sites of lymphoedema are also common sites affected.

Fat tissue and facial areas, typically around the eyes, ears and cheeks, are most susceptible to infection. Repeated infection of the extremities can lead to chronic swelling (lymphoedema).

Cause
Most cases of erysipelas are due to Streptococcus pyogenes, also known as group A β-hemolytic streptococci, less commonly to group C or G streptococci and rarely to Staphylococcus aureus. Newborns may contract erysipelas due to Streptococcus agalactiae, also known as group B streptococcus or GBS.

The infecting bacteria can enter the skin through minor trauma, human, insect or animal bites, surgical incisions, ulcers, burns and abrasions. There may be underlying eczema or athlete's foot (tinea pedis), and it can originate from streptococci bacteria in the subject's own nasal passages or ear.

The rash is due to an exotoxin, not the Streptococcus bacteria, and is found in areas where no symptoms are present, e.g. the infection may be in the nasopharynx, but the rash is found usually on the epidermis and superficial lymphatics.

Diagnosis
Erysipelas is usually diagnosed by the clinician looking at the characteristic well-demarcated rash following a history of injury or recognition of one of the risk factors.

Tests, if performed, may show a high white cell count, raised CRP or positive blood culture identifying the organism. Skin cultures are often negative.

Erysipelas must be differentiated from herpes zoster, angioedema, contact dermatitis, erythema chronicum migrans of early Lyme disease, gout, septic arthritis, septic bursitis, vasculitis, allergic reaction to an insect bite, acute drug reaction, deep vein thrombosis and diffuse inflammatory carcinoma of the breast.

Differentiating from cellulitis
Erysipelas can be distinguished from cellulitis by two particular features: its raised advancing edge and its sharp borders. The redness in cellulitis is not raised and its border is relatively indistinct. Bright redness of erysipelas has been described as a third differentiating feature.

Erysipelas does not affect subcutaneous tissue. It does not release pus, only serum or serous fluid. Subcutaneous edema may lead the physician to misdiagnose it as cellulitis.

Treatment
Treatment is with antibiotics; (amoxicillin/clavulanic acid, cefalexin, or cloxacillin) taken by mouth for five-days; though sometimes longer.

Because of the risk of reinfection, prophylactic antibiotics are sometimes used after resolution of the initial condition.

Prognosis
The disease prognosis includes:
 * Spread of infection to other areas of body can occur through the bloodstream (bacteremia), including septic arthritis. Glomerulonephritis can follow an episode of streptococcal erysipelas or other skin infection but not rheumatic fever.
 * of infection: Erysipelas can recur in 18–30% of cases even after antibiotic treatment. A chronic state of recurrent erysipelas infections can occur with several predisposing factors, including alcoholism, diabetes and athlete's foot. Another predisposing factor is chronic cutaneous edema, such as can in turn be caused by venous insufficiency or heart failure.
 * Lymphatic damage
 * Necrotizing fasciitis, commonly known as ‘flesh-eating’ bacterial infection, is a potentially deadly exacerbation of the infection if it spreads to deeper tissue.

Epidemiology
There is currently no validated recent data on the worldwide incidence of erysipelas. From 2004 to 2005 UK hospitals reported 69,576 cases of cellulitis and 516 cases of erysipelas. One book stated that several studies have placed the prevalence rate between one and 250 in every 10,000 people. The development of antibiotics, as well as increased sanitation standards, has contributed to the decreased rate of incidence. Erysipelas caused systemic illness in up to 40% of cases reported by UK hospitals and 29% of people had recurrent episodes within three years. Anyone can be infected, although incidence rates are higher in infants and elderly. Several studies also reported a higher incidence rate in women. Four out of five cases occur on the legs, although historically the face was a more frequent site.

Risk factors for developing the disease include
 * Arteriovenous fistula
 * Chronic skin conditions such as psoriasis, athlete's foot, and eczema
 * Excising the saphenous vein
 * Immune deficiency or compromise, such as
 * Diabetes
 * Alcoholism
 * Obesity
 * Human immunodeficiency virus (HIV)
 * In newborns, exposure of the umbilical cord and vaccination site injury
 * Issues in lymph or blood circulation
 * Leg ulcers
 * Lymphatic edema
 * Lymphatic obstruction
 * Lymphoedema
 * Nasopharyngeal infection
 * Nephrotic syndrome
 * Pregnancy
 * Previous episode(s) of erysipelas
 * Toe web intertrigo
 * Traumatic wounds
 * Venous insufficiency or disease

Preventive measures
Individuals can take preventive steps to decrease their risk of catching the disease. Properly cleaning and covering wounds is important for people with an open wound. Effectively treating athlete's foot or eczema if they were the cause of the initial infection will decrease the chance of the infection occurring again. People with diabetes should pay attention to maintaining good foot hygiene. It is also important to follow up with doctors to make sure the disease has not come back or spread. About one third of people who have had erysipelas will be infected again within three years. Rigorous antibiotics may be needed in the case of recurrent bacterial skin infections.

Notable cases
• Fatal, in order of death

• Archibald Douglas, 6th Earl of Angus, (d. 1557), Scottish nobleman active in the reigns of James V and Mary, Queen of Scots

• John of the Cross, Spanish saint and priest (d. 1591)

• Marin Mersenne, French theologian, philosopher and mathematician (d. 1648). In one of his letters R. Descartes writes to Mersenne that he wants to find some cure for his erysipelas.

• Margaret Throckmorton (d.1668) Prioress

• Michiel de Ruyter, Dutch admiral in the Anglo-Dutch wars, contracted from injuries sustained from a cannonball. (d. 1676)

• Christina, Queen of Sweden (d. 1689)

• Norborne Berkeley, baron de Botetourt, Royal Governor of Virginia (d. 1770)

• Princess Amelia of the United Kingdom, daughter of George III of the United Kingdom (1783–1810)

• Grand Duchess Catherine Pavlovna of Russia, daughter of Tsar Paul I of Russia and wife of King William I of Württemberg (d. 1819)

• William Wirt, United States Attorney General and U.S. presidential candidate (d. 1834)

• Charles Lamb, English writer and essayist (d. 1834)

• Prince Augustus Frederick, Duke of Sussex sixth son and ninth child of King George III (d. 1843)

• Barbara Hofland, English children's writer and novelist (d. 1844)

• Pope Gregory XVI (d. 1846)

• Mary Lyon, American women's education pioneer (d. 1849)

• Marie, Dowager Duchess of Saxe-Coburg-Gotha (d. 1860)

• John Herbert White, youngest son of James S. and Ellen G. White, co-founders of the Seventh-day Adventist church (d. 1860)

• Ralph Bullock, English jockey (d. 1863)

• Frederick VII of Denmark, king of Denmark (d. 1863)

• John Timon, First Roman Catholic Bishop of Buffalo, New York, United States (d. 1867)

• Nehemiah Bushnell, American attorney, railroad president, and politician (d. 1873)

• John Stuart Mill, English political philosopher (d. 1873)

• Marcus Clarke (1846–1881), Australian journalist, poet, playwright and novelist, who wrote "For the Term of His Natural Life", died age 35.

• John Brown, Scottish personal servant and companion to Queen Victoria (d. 1883)

• Mihai Eminescu, Romanian poet, novelist, journalist (d. 1889)

• Pat Killen, American heavyweight boxer, died at age 29 while in hiding in Chicago from police after assaulting two men (d. 1891)

• Samuel Augustus Ward, American organist, composer, teacher, businessman (d. 1903)

• Johann Most, German-American anarchist politician, newspaper editor, and orator. (d. 1906)

• James Anthony Bailey, American circus ringmaster (d. 1906)

• George Herbert, 5th Earl of Carnarvon (d. 1923), English aristocrat and financial backer of the search for and excavation of Tutankhamun's tomb in the Valley of the Kings.

• Miller Huggins, American baseball player and manager (d. 1929)

• Father Solanus Casey, American Capuchin priest declared "blessed" by the Roman Catholic Church (d. 1957)

• Chronic, recurrent

• Richard Wagner, opera composer, was prone to outbreaks of erysipelas throughout his adult life. He suffered notably from attacks throughout the year 1855 when he was 42.

• Acute

• Jair Bolsonaro, president of Brazil between 2019 and 2022, currently suffers from erysipelas.

• Recovered

• Lenin developed an infection in London, and party leadership was exercised by Martov until he recovered.

• Ernest Hemingway developed an infection near his left eye after being hit with an oar. He was treated at the Casa di Cura Morgagni in Padua.

• Fictional

• In D. H. Lawrence's novel Sons and Lovers one of the major characters in the novel, William Morel, dies quickly from the complications of erysipelas in conjunction with pneumonia.

• In Arthur Conan Doyle's 1924 short story, The Adventure of the Illustrious Client, Sherlock Holmes is reported to have developed erysipelas following an assault that resulted in head injuries requiring stitches.

• In Anton Chekhov's 1892 short story Ward No. 6 erysipelas is among the conditions suffered by the patients committed to a poorly run mental illness facility in a small town in tsarist Russia.

• In J. G. Farrell's novel The Siege of Krishnapur the Collector, Mr. Hopkins, is affected during the Siege and recovers.

• In Mark Twain's Roughing It mention is made of the disease due to the rarefied atmosphere (Chapter 43).

• In Dashiell Hammett's The Thin Man, the name is used for a pun on the word "ear" (Chapter 22).

• In Willa Cather's One of Ours, the main character, Claude, contracts the disease in "the queerest" way, after being dragged into wire by mules, and the next day continuing to work in the dust. The disease plays a key role in the novel, persuading him to marry Enid after she cares for him in recovery. (Book II, Chapter IV, p. 138).

• In an episode of Downton Abbey, Isobel Crawley misdiagnoses her butler, Molesley, with erysipelas when he develops a rash on his hands. The Dowager Countess of Grantham correctly identifies the rash as an allergy to rue.
 * In Rodrigo Souza Leão's autobiographical novel All Dogs are Blue, he says that his erysipelas is cured by the antibiotic Benzetacil (Benzathine benzylpenicillin).

History
It was historically known as St Anthony's fire.