Carpal Tunnel Syndrome And Tarsal Tunnel Syndrome Carpal tunnel syndrome is a condition in which irritation of the wrist's median nerve causes tingling and numbness of the thumb,...learn more Â». In This Article.
1 Argyria-characterised by a metallic, slate-grey or blue-grey pigmentation. 2  The hyperpigmentation is most apparent in the UV-exposed areas of skin, especially the forehead, nose, and hands, as well as mucous membranes. 3  Argyria results from prolonged contact with or ingestion of silver salts.
Blue-gray discoloration of sun-exposed skin. Argyria. Rare skin condition associated with prolonged use of silver-containing products; typically affects skin, fingernails, oral mucosa, and conjunctival membranes; histologic examination shows silver granules in the dermis, particularly in the basal layer of sweat glands.