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amalgam tattoo
Amalgam tattoo (also termed localized argyrosis, or focal argyrosis)〔''Argyrosis'' is an uncommon synonym of argyria, a condition caused by excessive exposure to silver, where the skin and mucous membranes are discolored blue or black. Some have criticized these as inappropriate synonyms for amalgam tattoo since silver is just one of several components of dental amalgam (See Neville 2001)〕 is a grey, blue or black area of discoloration on the mucous membranes of the mouth, typically on the gums of the lower jaw. It is an iatrogenic lesion, caused by entry of dental amalgam into the soft tissues. It is common, painless, and benign, but it can be mistaken for melanoma.
==Signs and symptoms==
Amalgam tattoo usually occurs on the mandibular gingiva, often in an area in which a apicectomy ("root-end filling") with amalgam was carried out.〔 After the gingiva, the alveolar mucosa and the buccal mucosa are the next most common sites, although any mucosal site in the mouth is possible.〔 It is painless, and appears as a blue-black or grey discolored macule on the surface of the mucosa.〔 The borders of the tattoo are variable, and may be well defined, irregular or defuse.〔
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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