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argyria
Argyria or argyrosis (from ''argyros'' silver) is a condition caused by inappropriate exposure to chemical compounds of the element silver, or to silver dust. The most dramatic symptom of argyria is that the skin turns blue or bluish-grey. It may take the form of ''generalized argyria'' or ''local argyria''. Generalized argyria affects large areas over much of the visible surface of the body. Local argyria shows in limited regions of the body, such as patches of skin, parts of the mucous membrane or the conjunctiva.
The terms argyria and argyrosis have long been used interchangeably,〔Guttmann, Paul. tr. by A. Napier. A handbook of physical diagnosis comprising the throat, thorax and abdomen. 1879. May be downloaded from https://archive.org/details/ahandbookphysic02guttgoog〕 with argyria being used more frequently. Argyrosis has been used particularly in referring to argyria of the conjunctiva, but the usage has never been consistent and cannot be relied on except where it has been explicitly specified.〔Fox, Lawrance Webster. A practical treatise on ophthalmology. Pub. D. Appleton and company NY. 1920. May be downloaded from https://archive.org/details/apracticaltreat00foxgoog〕
==Cause==
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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