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redness of the skin caused by congestion of the capillaries in the lower layers of the skin. It occurs with any skin injury, infection, or inflammation.
erythema chro´nicum mi´grans a ring-shaped erythema due to the bite of a tick of the genus Ixodes; it begins as an erythematous plaque several weeks after the bite and spreads peripherally with central clearing. Often there are also systemic symptoms, including chills, fever, headache, vomiting, backache, and stiff neck. See also lyme disease.
gyrate erythema (erythema gyra´tum) erythema multiforme characterized by the development of lesions that tend to migrate and spread peripherally with central clearing.
erythema ab ig´ne permanent erythema produced by prolonged exposure to excessive nonburning heat. It is seen most often on the legs of women, but under appropriate environmental circumstances, it can occur anywhere on the body in either sex.
erythema indura´tum a chronic necrotizing vasculitis, usually occurring on the calves of young women; see also bazin's disease.
erythema infectio´sum a mild, self-limiting disease of childhood characterized by a lacelike skin rash symmetrically distributed on the hands, arms, and legs, with few or no other symptoms; occasionally there is a low grade fever, and the condition often clears up without specific treatment. The incubation period is six days to two weeks. This disease is contagious and originally was believed to be a form of rubella; because the rash can resemble that of scarlet fever and German measles, it is important to differentiate this mild condition from those more serious ones. Called also fifth disease.
erythema margina´tum a type of erythema multiforme in which the reddened areas are disk-shaped, with elevated edges.
erythema margina´tum rheuma´ticum a superficial, often asymptomatic, form of gyrate erythema associated with some cases of rheumatic fever, which is characterized by the presence on the trunk and extensor surfaces of the extremities of a transient eruption of flat to slightly indurated, nonscaling, and usually multiple lesions.
erythema mi´grans geographic tongue.
erythema multifor´me a symptom complex representing a reaction of the skin and mucous membranes secondary to various known, suspected, and unknown factors, including infections, ingestants, physical agents, malignancy, and pregnancy. The conditions in the complex are characterized by the sudden onset of a reddened macular, bullous, papular, or vesicular eruption, the characteristic lesion being the iris, bull's eye, or target lesion, which consists of a central papule with two or more concentric rings. The complex includes a mild self-limited mucocutaneous form (erythema multiforme minor) and a severe, sometimes fatal, multisystem form (stevens-johnson syndrome).
erythema nodo´sum a type of panniculitis occurring usually as a hypersensitivity reaction to multiple provoking agents, including various infections, drugs, sarcoidosis, and certain enteropathies. It may also be of idiopathic origin. It most often affects young women and is characterized by the development of crops of transient, inflammatory, nonulcerating nodules that are usually tender, multiple, and bilateral, and most commonly located on the shins; the lesions involute slowly, leaving bruiselike patches without scarring. The acute disease is often associated with fever, malaise, and arthralgias. A chronic variant sometimes occurs without any serious associated systemic disease.
toxic erythema (erythema tox´icum) a generalized erythematous or erythematomacular eruption due to administration of a drug or to bacterial or other toxins or associated with various systemic diseases.
erythema tox´icum neonato´rum a benign, idiopathic, very common, generalized, transient eruption occurring in infants during the first week of life, usually consisting of small papules or pustules that become sterile, yellow-white, firm vesicles surrounded by an erythematous halo and some edema.


Redness due to capillary dilation, usually signaling a pathologic condition (for example, inflammation, infection). Compare: telangiectasia.
[G. erythēma, flush]


/er·y·the·ma/ (er″ĭ-the´mah) redness of the skin due to congestion of the capillaries.erythem´atouserythe´mic
erythema annula´re  a type of erythema multiforme with ring-shaped lesions.
erythema annula´re centri´fugum  a chronic variant of erythema multiforme usually affecting the thighs and lower legs, with single or multiple erythematous-edematous papules that enlarge peripherally and clear in the center to produce annular lesions that may coalesce.
erythema chro´nicum mi´grans  an annular erythema due to the bite of a tick (Ixodes); it begins as an erythematous plaque several weeks after the bite and spreads peripherally with central clearing. See also Lyme disease, under disease.
cold erythema  a congenital hypersensitivity to cold seen in children, characterized by localized pain, widespread erythema, occasional muscle spasms, and vascular collapse on exposure to cold, and vomiting after drinking cold liquids.
epidemic arthritic erythema  Haverhill fever.
erythema indura´tum  chronic necrotizing vasculitis, usually occurring on the calves of young women; its association with tuberculosis is in dispute.
erythema infectio´sum  a mildly contagious, sometimes epidemic, disease of children between the ages of four and twelve, marked by a rose-colored, coarsely lacelike macular rash and caused by human parvovirus B19.
erythema i´ris  a type of erythema multiforme in which the lesions form concentric rings, producing a target-like appearance.
erythema margina´tum  a type of erythema multiforme in which the reddened areas are disk-shaped with elevated edges.
erythema mi´grans 
erythema multifor´me  a symptom complex with highly polymorphic skin lesions, including macular papules, vesicles, and bullae; attacks are usually self-limited but recurrences are the rule.
erythema nodo´sum  an acute inflammatory skin disease marked by tender red nodules, usually on the shins, due to exudation of blood and serum.
erythema nodo´sum lepro´sum  a form of lepra reaction occurring in lepromatous and sometimes borderline leprosy, marked by the occurrence of tender, inflamed subcutaneous nodules; the reactions resemble multifocal Arthus reactions.
toxic erythema , erythema tox´icum a generalized erythematous or erythematomacular eruption due to administration of a drug or to bacterial toxins or other toxic substances.
erythema tox´icum neonato´rum  a self-limited urticarial condition affecting infants in the first few days of life.


Redness of the skin caused by dilatation and congestion of the capillaries, often a sign of inflammation or infection.

er′y·them′a·tous (-thĕm′ə-təs, -thē′mə-), er′y·the·mat′ic (-măt′ĭk), er′y·the′mic adj.


Etymology: Gk, erythros, red
redness or inflammation of the skin or mucous membranes that is the result of dilation and congestion of superficial capillaries. Examples of erythema are nervous blushes and mild sunburn. See also erythroderma, rubor. erythematous, adj.


A general term for reddening, especially of a mucocutaneous surface, rash


Redness of the skin due to capillary dilatation.
[G. erythēma, flush]


(er?i-the'ma ) [Gr. erythema, redness]
Reddening of the skin. Erythema is a common but nonspecific sign of skin irritation, injury, or inflammation. It is caused by dilation of superficial blood vessels in the skin. erythematicerythematous (er?i-the-mat'ik) (er?i-them'at-us), adjective

erythema ab igne

Localized erythema due to exposure to heat.
Synonym: toasted skin syndrome.
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erythema annulare

A red, ring-shaped rash.
See: illustration

erythema cenicienta

Erythema dyschromicum perstans.

erythema chronicum migrans

Abbreviation: ECM
Erythema migrans.

erythema dyschromicum perstans

Awaiting Don's def.
Synonym: ashy dermatosis; erythema cenicienta

erythema elevatum diutinum

A form of vasculitis that affects the skin on the extensor surfaces of the forearms or legs. Iit is often seen in those infected with HIV.

erythema induratum

Chronic vasculitis of the skin occurring in young women. Hard cutaneous nodules break down to form necrotic ulcers and leave atrophic scars.
Synonym: Bazin disease

erythema infectiosum

A mild, moderately contagious disease seen most commonly in school-age children. Synonym: fifth disease


The causative agent is human parvovirus B-19. Transmission is thought to be via respiratory secretions from infected patients; however, maternal-fetal transmission can occur and hemolytic disease of the newborn may result.


Patients experience a mild, brief illness; complaints include fever, malaise, headache, and pruritus. The characteristic erythema appears about 10 days later. Facial redness is similar to that which occurs when a child is slapped; however, circumoral redness is absent. Several days following initial erythema, a less distinct rash may appear on the extremities and trunk. The rash usually resolves within 1 week but may occur for several weeks when the patient is exposed to heat, cold, exercise, or stress. Adults may also experience arthralgia and arthritis although these symptoms are less common in children. In addition, mild transient anemia, thrombocytopenia, and leukopenia may develop.


Most patients require no specific therapy. Patients with chronic hemolytic anemia may experience transient aplastic crisis (TAC). These patients should be warned of the danger of exposure to parvovirus B-19 infection, informed of the early signs and symptoms, and instructed to seek medical consultation promptly if exposure is suspected. Patients with TAC may develop a life-threatening anemia that requires immediate blood transfusion or partial exchange transfusion.

erythema intertrigo


linear gingival erythema

A band of inflammation of the periodontium, appearing as a reddish gingival band about 2 to 3 mm in width. It is often associated with HIV/AIDS. Synonym: red band gingivitis

erythema marginatum

A form of erythema multiforme in which the center of the area fades, leaving elevated edges.

erythema migrans

Abbreviation: EM
The hallmark of acute infection with Lyme disease. EM is an expanding red rash with a sharply defined border and (typically) central clearing. The rash usually appears within 3–32 days after a tick bite. The center of the rash is the site of inoculation. The causative agent is Borrelia burgdorferi, a spirochete that may later invade the joints, the central nervous system, or the conducting system of the heart.
Synonym: erythema chronicum migrans See: Lyme disease for illus
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erythema multiforme

Abbreviation: EM
A rash usually caused by an immune response to drugs or to an infection, esp. herpes simplex virus. It may express itself on the skin in multiform ways, including macules, papules, blisters, hives, and, characteristically, iris or target lesions. It may involve the palms and soles, the mucous membranes, the face, and the extremities. The disease is usually self-limited. The most severe (and occasionally fatal) variant of the illness, in which the eyes, mouth, and internal organs are involved, is called Stevens-Johnson syndrome, or toxic epidermal necrolysis. Synonym: Hebra disease (1.) See: illustration

necrolytic migratory erythema

Abbreviation: NME
Red, blistering or crusting patches that appear on the skin of the buttocks, groin, lower extremities, or perineum. The lesions are itchy and painful. NME is often associated with glucagonomas.

erythema nodosum

A tender, red, nodular rash on the shins that typically arises in conjunction with another illness, e.g., such as a streptococcal, fungal, or tubercular infection; inflammatory bowel disease; occult cancer; or sarcoidosis. Biopsies of the rash reveal inflammation of subcutaneous fat (panniculitis). Because the disease is often associated with other serious illnesses, a diagnostic search for an underlying cause usually is undertaken. In some patients, no cause is identified.


Therapy is directed at the cause, when it is known. Nonsteroidal anti-inflammatory drugs provide symptomatic relief for many patients.

erythema nodosum leprosum

Abbreviation: ENL
A red, nodular vasculitic rash, which may be a complication of the treatment for leprosy. See: lepra


Treatment consists of withdrawing therapy against leprosy (clofazimine, steroids, thalidomide).

punctate erythema

Erythema occurring in minute points, such as scarlet fever rash.

toxic erythema

Redness of the skin or a rash resulting from toxic agents such as drugs.

erythema toxicum neonatorum

A benign, self-limited rash marked by firm, yellow-white papules or pustules from 1 to 2 mm in size present in about 50% of full-term infants. The cause is unknown, and the lesions disappear without need for treatment.

erythema venenatum

Erythema caused by contact with a toxic substance.


Redness of the skin from widening (dilatation) of the small skin blood vessels. This may result from one of a very large number of causes such as blushing, ROSACEA, ECTASIA of blood vessels, INFLAMMATION and rashes (exanthemata).


The medical term for redness of the skin produced by congestion of the capillaries in the skin.

erythema (er··thēˑ·m),

n mild redness caused by congested or dilated capillaries close to the surface of the skin as in mild sunburns and blushing due to embarrassment.
Enlarge picture


Redness due to capillary dilation, usually signaling a pathologic condition (e.g., inflammation, infection).
Compare: telangiectasia
[G. erythēma, flush]


redness of the skin caused by congestion of the capillaries in the lower layers of the skin. It occurs with any skin injury, infection or inflammation.

erythema ab igne
that due to exposure to radiant heat.
erythema chronicum migrans
the early skin rash at the site of the tick bite which infects humans with Borellia burgdorferi (Lyme disease); rarely seen in dogs.
erythema multiforme
a disease of unknown etiology, but is sometimes drug-related; presumed to be immune-mediated. It occurs in all species and is characterized by an acute onset of erythematous macules, papules, vesicles or bullae. There may also be fever, depression and anorexia.
erythema multiforme major
a rapidly fulminating, ulcerative form of erythema multiforme with involvement of oral mucosa and systemic signs.
necrolytic migratory erythema
in humans, a skin disease associated with glucagon-secreting tumors of the pancreas. The same association has not been observed in dogs, but disease of the liver and pancreas is often present. There are vesicles and crusted, ulcerated lesions, mainly on the face, mucocutaneous areas, distal limbs and feet.
erythema nodosum
a rare disorder in dogs characterized by fever, depression, arthralgia and septal panniculitis.
toxic erythema, erythema toxicum
a generalized erythematous or erythematomacular eruption due to administration of a drug or to bacterial toxins or other toxic substances.