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geographic tongue
Geographic tongue (also known as benign migratory glossitis,〔 erythema migrans,〔 erythema migrans lingualis,〔 glossitis areata exfoliativa,〔(【引用サイトリンク】url=http://www.nlm.nih.gov/cgi/mesh/2013/MB_cgi )〕 glossitis areata migrans, lingua geographica, psoriasiform mucositis, stomatitis areata migrans, wandering rash of the tongue,〔 and transitory benign plaques of the tongue), is an inflammatory condition of the mucous membrane of the tongue, usually on the dorsal surface. It is a common condition, affecting approximately 2–3% of the general population.〔 It is characterized by areas of smooth, red depapillation (loss of lingual papillae) which migrate over time. The name comes from the map-like appearance of the tongue, with the patches resembling the islands of an archipelago. The cause is unknown, but the condition is entirely benign (importantly, it does not represent oral cancer), and there is no curative treatment. Uncommonly, geographic tongue may cause a burning sensation on the tongue, for which various treatments have been described with little formal evidence of efficacy.
==Classification==
Geographic tongue could be considered to be a type of glossitis. It usually presents only on the dorsal 2/3 and lateral surfaces of the tongue,〔 but less commonly an identical condition can occur on other mucosal sites in the mouth, such as the ventral surface (undersurface) of the tongue, mucosa of the cheeks or lips, soft palate or floor of mouth; usually in addition to tongue involvement.〔 In such cases, terms such as stomatitis erythema migrans,〔 ectopic geographic tongue, areata migrans,〔 geographic stomatitis,〔 or migratory stomatitis are used instead of geographic tongue. Beside the differences in locations of presentation inside the oral cavity and prevalence among the general population, in all other aspects of clinical significance, symptoms, treatment, and histopathologic appearance, these two forms are identical.
This condition is sometimes termed (oral) erythema migrans, but this has no relation to the more common use of the term erythema migrans (erythema chronicum migrans), to describe the appearance of skin lesions in Lyme disease.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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