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.
The hair follicle contains oil-secreting glands, which make the hair shiny. Stress and illness and lack of proper nutrients diminish secretion of oil and pigments causing graying of hair. The hair is considered as a tissue which uses the same nutrients of bone, nails and which is formed as bi-product of bone tissue.