Black hairy tongue
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2008-07-13T01:15:34Z
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[[Image:Black tounge.jpg|thumb|A picture of Black hairy tongue.]]
{{Infobox_Disease |
Name = {{PAGENAME}} |
Image = Niacin.png |
Caption = Niacin |
DiseasesDB = 31923 |
ICD10 = {{ICD10|K|14|3|k|00}} |
ICD9 = {{ICD9|529.3}} |
ICDO = |
OMIM = |
MedlinePlus = |
eMedicineSubj = derm |
eMedicineTopic = 639 |
MeshID = |
}}
'''Black hairy tongue''' refers to a number of conditions of humans and animals that cause the [[tongue]] to become unusually dark and/or hairy in appearance.
Black hairy tongue in humans is a harmless condition caused by a [[fungus]] which grows on the top surface of the tongue.<ref>[http://www.mayoclinic.com/health/black-hairy-tongue/HQ00325 Black, hairy tongue: What causes it? - MayoClinic.com<!-- Bot generated title -->]</ref> It is associated with the [[elderly]], as well as with [[antibiotic]] use. It is more commonly seen in [[tobacco smoking|tobacco smokers]]. While black is the most common color associated with the condition other colors are also possible.
== Causes in humans ==
'''Hairy tongue''' ('''lingua villosa''') is a common condition caused by defective [[desquamation]] of the [[Filiform papilla|filiform papillae]] that results from a variety of precipitating factors. Some of these factors include poor oral hygiene, [[edentulism|tooth loss]] (because their soft diet does not allow for normal desquamation from rough food scraping the tongue), chronic or extensive use of antibiotics, and radiation treatments to the head and neck. Patients with hairy tongue are more often than not coffee or tea drinkers and often use tobacco. It is also commonly seen in patients who are HIV positive or use intravenous drugs, although there is no predictive value to the finding of hairy tongue. One would assume that it is the result of shared lifestyle habits such as poor oral hygiene, use of tobacco, coffee drinking, etc.
Hairy tongue is often referred to as black hairy tongue (lingua villosa nigra), but it may also appear brown, white, green, or pink - often due to secondary factors such as mouthwashes, breath mints, etc. The "hairy" areas are usually on the posterior (back) of the tongue and never involve the undersurface. Hairy tongue is not a harmful disorder, and is normally asymptomatic. Patients with hairy tongue often may develop a secondary infection of [[Candida albicans]] (thrush). It is unclear if hairy tongue itself is a predisposing factor, as the underlying causes of hairy tongue may also lead to the development of thrush.
[[Pepto-Bismol]] has been known to cause one's tongue and stool to turn black.<ref>[http://www.poopreport.com/Doctor/Knowledgebase/blacktongue.html black tongue and blue poo | PoopReport.com<!-- Bot generated title -->]</ref> This form of "black tongue," however, is a result of the separation of bismuth from salicylate, forming [[bismuth(III) sulfide]] (Bi<sub>2</sub>S<sub>3</sub>) in combination with the sulfur found in saliva.<ref>[http://www.pepto-bismol.com/faqs.shtml#7 Pepto-Bismol<!-- Bot generated title -->]</ref>
It is also possible for the tongue to turn dark in a similar manner after eating or drinking certain things such as [[beetroot]] or [[red wine]].
== Treatment ==
Treatment consists of good [[oral hygiene]] and use of a toothbrush or tongue scraper to aid with the [[desquamation]] of the tongue. Use of antifungals may be warranted if there is a suspicion of candidal infection.
If antibiotic use lead to the condition then the condition may resolve naturally after the antibiotic course is completed.
== In animals ==
'''Black tongue''' is a condition seen in [[dog]]s, caused by a deficiency of [[niacin]], associated with ulcers and inflammation of the dog's [[oral cavity]].
==See also==
* [[Pellagra]]
==References==
{{reflist}}
{{Oral pathology}}
[[Category:Oral pathology]]
[[Category:Diseases]]
[[ar:لسان أسود مشعر]]
[[de:Schwarze Haarzunge]]
[[hu:Szőrös nyelv]]
[[it:Lingua nera villosa]]
[[nl:Haartong]]
[[pt:Língua negra pilosa]]