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.
If you have any doubt about a spot on your skin, have it checked out by a doctor or skin specialists. Skin Discoloration â Some Causes. The purpose of our bodies pigment is to absorb ultraviolet light from the sun and protect it from radiation damage. For some folks exposure to the sun produces a nice even tan. For others, particularly those with lighter skin tones, patchy areas of tanned skin or an increase in freckles is more than likely. Simply getting older can cause skin to change color. Melanin is the compound that takes care of how much pigment is produced, and as people get older, like a lot of other things, melanin production often gets a little off kilter.