The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).
The problem behind your itchy skin might be insufficient vitamin intake. There are a number of vitamins that promote the hydration and healthiness of your skin. A shortage in these could trigger itchiness, dry skin and other skin conditions. Alternatively, an overdose of such vitamins might also lead to itchy skin.
Vitamin B12 (Cyanocobalamin) deficiency causes white spots on the skin. Vitamin B12 is a water soluble vitamin of the B complex and one of its form is known as Cyanocobalamin. Vit B12 is vital for the normal functioning of the nervous system and in the production of other B complex vitamins.itamin B12 deficiency causes white spots on the skin. These vit B12 deficiency white spots on skin, lack melanin and occur anywhere on the body. These vit B12 deficiency caused white spots may be itchy, often occurring on the outside of the forearm.