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.
Skin tone type refers to the color of your skin, as determined by the amount of melanin it contains. Melanin is a pigment that in greater supply produces a darker skin tone type and produces a light or fair skin tone type when not much is present in skin cells.elanin is a pigment that in greater supply produces a darker skin tone type and produces a light or fair skin tone type when not much is present in skin cells.