| Figurate erythema | |
|---|---|
 | |
| Erythema marginatum | |
| Specialty | Dermatology |
Figurate erythema is a form of erythema (reddening of the skin) that presents in a ring or an arc shape. An example is erythema marginatum. [1]
Classical types include: [2]
| Figurate erythema | |
|---|---|
| | |
| Erythema marginatum | |
| Specialty | Dermatology |
Figurate erythema is a form of erythema (reddening of the skin) that presents in a ring or an arc shape. An example is erythema marginatum. [1]
Classical types include: [2]
The term figurate number is used by different writers for members of different sets of numbers, generalizing from triangular numbers to different shapes and different dimensions. The term can mean
Erythema is redness of the skin or mucous membranes, caused by hyperemia in superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology include nervous blushes.
An octagonal number is a figurate number that gives the number of points in a certain octagonal arrangement. The octagonal number for n is given by the formula 3n2 − 2n, with n > 0. The first few octagonal numbers are
Erythema multiforme (EM) is a skin condition that appears with red patches evolving into target lesions, typically on both hands.
Erythema marginatum is an acquired skin condition which primarily affects the arms, trunk, and legs. It is a type of erythema characterised by bright pink or red circular lesions which have sharply-defined borders and faint central clearing. The lesions typically range from 3 to 10 cm in size, and are distributed symmetrically over the torso and inner surfaces of the limbs and extensor surfaces. The lesions last between one and four weeks but have been known to be present on patients for as long as several months.
Ferdinand-Jean Darier was a French physician, pathologist and dermatologist called the "father of modern dermatology in France".
Erythema nodosum (EN) is an inflammatory condition characterized by inflammation of subcutaneous fat tissue, resulting in painful red/blue lumps or nodules that are usually seen symmetrically on both shins, on the thighs, arms, and elsewhere. It can be caused by a variety of conditions but 20 to 50% of cases are idiopathic. It typically resolves spontaneously within 30 days. It is common in young people aged 12–20 years.
Erythema ab igneEAI, also known as hot water bottle rash, is a skin condition caused by long-term exposure to heat. Prolonged thermal radiation exposure to the skin can lead to the development of reticulated erythema, hyperpigmentation, scaling, and telangiectasias in the affected area. Some people may complain of mild itchiness and a burning sensation, but often, unless a change in pigmentation is seen, it can go unnoticed.
Erythema migrans or erythema chronicum migrans is an expanding rash often seen in the early stage of Lyme disease, and can also be caused by southern tick-associated rash illness (STARI). It can appear anywhere from one day to one month after a tick bite. This rash does not represent an allergic reaction to the bite, but rather an actual skin infection of one of the Lyme bacteria species from the genus Borrelia. The rash's name comes from Neo-Latin for "migrating redness."
Geissoloma is a genus of flowering plants in the monotypic family Geissolomataceae, native to the Cape Province of South Africa. Geissoloma marginatum is the only species in the family. It is sometimes called guyalone in English. The plants are xerophytic evergreen shrubs and are known to accumulate aluminum.
Erythema gyratum repens is a skin condition that has a strong association with internal cancers. It characteristically presents with red wavy lines, generally in older adults. These regular whirly rings rapidly and repetitively appear within existing ones, giving the impression that the rash is moving. The resulting pattern is similar to wood grain. There is often an intense itch and scale over the leading edge, which may be slightly raised.
Annular erythema of infancy(AEI) consists of self-limited eruptions of erythematous, annular to polycyclic patches and plaques. It is an idiopathic figurate erythema. Over several days, a single lesion disappears without leaving behind any scale or hyperpigmentation. Mostly affecting the trunk, face, and extremities, this rash has no symptoms. The diagnosis of AEI is made through a combination of histopathologic and clinical examinations. The disease first manifests in infancy, and if treatment is not received, the periodic eruptions usually stop after the first year of life.
Clinostomum marginatum is a species of parasitic fluke. It is commonly called the "Yellow grub". It is found in many freshwater fish in North America, and no fish so far is immune to this parasite. It is also found in frogs. Clinostomum marginatum can also be found in the mouth of aquatic birds such as herons and egrets. They are commonly present in the esophagus of fish-eating birds and reptiles. Eggs of these trematodes are shed in the feces of aquatic birds and released into water. Aquatic birds become hosts of this parasite by ingesting infected freshwater fish. The metacercariae are found right beneath the skin or in the muscles of host fish.
Marginatum, a Latin adjective meaning having a distinct margin, may refer to:
Tete orthobunyavirus is a bunyavirus found originally in Tete Province, Mozambique. It is a disease of animals and humans. Two forms, Bahig and Matruh viruses, were isolated from bird ticks including Hyalomma marginatum, but elsewhere mosquitoes and biting midges have been implicated as vectors.
The centered polyhedral numbers are a class of figurate numbers, each formed by a central dot, surrounded by polyhedral layers with a constant number of edges. The length of the edges increases by one in each additional layer.
A centered tetrahedral number is a centered figurate number that represents a tetrahedron. That is, it counts the dots in a three-dimensional dot pattern with a single dot surrounded by tetrahedral shells. The th centered tetrahedral number, starting at for a single dot, is:
A dodecahedral number is a figurate number that represents a dodecahedron. The nth dodecahedral number is given by the formula
An icosahedral number is a figurate number that represents an icosahedron. The nth icosahedral number is given by the formula
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