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Smokeless tobacco keratosis
Smokeless tobacco keratosis (abbreviated to STK, also termed snuff dippers' keratosis, smokeless tobacco-associated keratosis, snuff pouch, snuff dipper's lesion,〔 tobacco pouch keratosis,〔 or spit tobacco keratosis)〔 is a condition which develops on the oral mucosa (the lining of the mouth) in response to smokeless tobacco use. Generally it appears as a white patch, located at the point where the tobacco is held in the mouth. The condition usually disappears once the tobacco habit is stopped. It is associated with slightly increased risk of mouth cancer.
==Background==
There are many types of smokeless tobacco. Chewing tobacco is shredded, air-cured tobacco with flavoring. Dipping tobacco ("moist snuff") is air or fire-cured, finely cut tobacco. Dry snuff is ground or pulverised tobacco leaves. In the Indian subcontinent, the Middle-East and South-East Asia, tobacco may be combined in a quid or paan with other ingredients such as betel leaf, Areca nut and slaked lime.〔 Use of Areca nut is associated with oral submucous fibrosis.〔 An appearance termed Betel chewer's mucosa describes morsicatio buccarum with red-staining of mucosa due to betel quid ingredients.〔 In Scandinavian countries, snus, a variant of dry snuff, is sometimes used.〔 In the United States of America, the most common form of smokeless tobacco is dipping tobacco, although chewing tobacco is sometimes used by outdoor workers and dry snuff is common among females in the Southern states.〔〔 The overall prevalence of smokeless tobacco use in the USA is about 4.5%, but this is higher in Mid-Western and Southern states.〔
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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