lichen


lichen
A discrete flat papule or an aggregate of papules giving a patterned configuration resembling l. growing on rocks. [G. leichen, l.; a lichenlike eruption]
- l. myxedematosus a lichenoid eruption of papules on the upper body of mucinous edema due to deposit of glycosaminoglycans in the skin and fibroblast proliferation, in the absence of endocrine disease. Monoclonal gammopathy is often present. SEE ALSO: scleromyxedema. SYN: papular mucinosis.
- l. nitidus minute asymptomatic whitish or pinkish papules; lesions, which are flat-topped, rarely may coexist with l. planus and may involve male genitalia.
- l. nuchae l. simplex of the neck, usually in women.
- l. obtusus a form in which the papules are large and rounded instead of flattened.
- oral (erosive) l. planus oral manifestations of l. planus characterized by white striae (Wickham striae) of the oral mucous membrane and sometimes associated with ulceration; patients may or may not exhibit a history of cutaneous l. planus.
- l. planopilaris a rare, patchy alopecia with follicular hyperkeratosis of the scalp and lymphocytic perifolliculitis with l. planus elsewhere.
- l. planus eruption of flat-topped, shiny, violaceous papules on flexor surfaces, male genitalia, and buccal mucosa of unknown cause; may form linear groups; microscopically characterized by a band-like subepidermal lymphocytic infiltrate. Spontaneous resolution is common after months to years.
- l. planus annularis a form in which the papules are grouped in ring figures.
- l. planus follicularis l. planus of the hair follicles, usually of the scalp.
- l. planus hypertrophicus verrucoid or warty lesions occurring on legs and thighs in association with l. planus elsewhere. SYN: l. planus verrucosus.
- l. planus verrucosus SYN: l. planus hypertrophicus.
- l. ruber moniliformis a rare dermatosis consisting of small reddish papules arranged in narrow beaded bands and covering large areas of the body.
- l. sclerosus et atrophicus an eruption consisting of pruritic white atrophic papules and plaques that may be discrete or confluent and may contain a central depression or a black keratotic plug microscopically showing epidermal hyperkeratosis and atrophy, superficial dermal edema and homogenization, and mid-dermal inflammation; occurs most commonly in prepubertal and postmenopausal females; vulval involvement was formerly called kraurosis vulvae.
- l. scrofulosorum small asymptomatic l. papules on the trunk of children with tuberculosis; acid-fast bacilli are not seen in the dermal granulomas. SYN: papular tuberculid.
- l. simplex chronicus a thickened area of itching skin resulting from rubbing and scratching.
- l. spinulosus eruption of conical papules, of unknown cause, which have an adherent scaly surface; may be related to l. planus.
- l. striatus a self-limited papular eruption occurring primarily in children (more commonly in females); the lesions are arranged in linear groups and usually occur on one extremity.

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li·chen 'lī-kən n
1) any of several skin diseases characterized by the eruption of flat papules esp LICHEN PLANUS
2) any of numerous complex plantlike organisms made up of an alga and a fungus growing in symbiotic association on a solid surface (as a rock)

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li·chen (liґkən) [Gr. leichēn a tree-moss] 1. any of the many thallophytic plants formed by mutualistic combination of an alga and a fungus, the algal component being a green or blue-green alga, and the fungal usually an ascomycete. 2. any of a number of papular skin diseases in which the lesions are small, firm papules set close together.

Medical dictionary. 2011.

Look at other dictionaries:

  • lichen — [ likɛn ] n. m. • 1363 lichines; mot lat., gr. leikhên, littéralt « qui lèche » 1 ♦ Méd. Vx Dermatose caractérisée par la présence de papules. Mod. Lichen plan : maladie cutanée de cause inconnue, bien individualisée par une éruption disséminée… …   Encyclopédie Universelle

  • LICHEN — (от греч. leichen лишай), название, унаследованное от Гиппократа и Галена и употреблявшееся в дерматологической литературе 18 и 19 вв. для обозначения самых разнообразных кожных заболеваний, главным же образом в смысле, придаваемом ему Вилланом… …   Большая медицинская энциклопедия

  • Lichen — ist die wissenschaftliche Bezeichnung für die Lebensform Flechte. in der Medizin die Bezeichnung für verschiedene nichtinfektiöse Hauterkrankungen, die in der Regel mit einem kleinpapulösem Exanthem einhergehen Einige Formen sind: Lichen pilaris… …   Deutsch Wikipedia

  • lichen — LICHÉN, licheni, s.m. 1. (La pl.) Grup de plante inferioare ale caror tal este compus dintr o ciupercă şi o algă aflate în simbioză, care cresc pe scoarţa arborilor bătrâni, pe ziduri, pe stânci, etc.; (şi la sg.) plantă care face parte din acest …   Dicționar Român

  • Lichen — Li chen (l[imac] k[e^]n; 277), n. [L., fr. Gr. leichh n.] 1. (Bot.) One of a class of cellular, flowerless plants, (technically called {Lichenes}), having no distinction of leaf and stem, usually of scaly, expanded, frond like forms, but… …   The Collaborative International Dictionary of English

  • lichen — c.1600, from L. lichen, from Gk. leichen, originally what eats around itself, probably from leichein to lick (see LICK (Cf. lick)). Originally used of liverwort; the modern sense first recorded 1715. Related: Lichenaceous …   Etymology dictionary

  • Lichen [1] — Lichen (Bot.), Flechten, s.d. L. barbatus, (L. cranii humani, L. florĭdus, L. plicatus), ist Usnea plicata Ach. L. caninus (L. cinereus terrestris), ist Peltigera canina. L. caraghen, ist Chondrus crispus. L. islandicus, ist Isländisches Moos. L …   Pierer's Universal-Lexikon

  • Lichen [2] — Lichen (Schwindknötchen), kleine weiße od. rothe, mit einer talgartigen Masse gefüllte Knötchen,[343] welche stark jucken od. brennen, erscheinen auf allen Theilen des Körpers, zumeist an Hals, Gesicht u. Vorderarme, verschwinden oft in einigen… …   Pierer's Universal-Lexikon

  • Lichen [1] — Lichen L., alte Pflanzengattung, unter der früher fast alle Flechten begriffen wurden; Lichenes, die Klasse der Flechten (s. d.). L. islandicus, isländisches Moos (s. Cetraria); L. islandicus ab amaritie liberatus, entbittertes isländisches Moos …   Meyers Großes Konversations-Lexikon

  • Lichen [2] — Lichen (lat., Schwindflechte), eine Hautflechte in Form kleiner, vereinzelter, in Kreisen angeordneter oder weit ausgebreiteter gelblicher oder rötlicher Knötchen. Man unterscheidet den L. scrophulosorum und den L. ruber. Bei ersterm finden sich… …   Meyers Großes Konversations-Lexikon

  • Lichen — Lichen, bei Linné Gattungsname für die Flechten, jetzt nur noch in der pharmazeut. Terminologie gebräuchlich (z.B. L. islandĭcus für Isländ. Moos u.a.). – In der Medizin s.v.w. Schwindflechte (Hautkrankheit) …   Kleines Konversations-Lexikon


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