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.
That is to say, peels of skin off your hands due to a vitamin deficiency can be due to Biotin or vitamin B-7, Niacin or vitamin B3 (in severe deficiencies). In general, under severe conditions, deficiency of any vital body vitamin that leads to dryness in skin, will eventually cause peeling and sometimes flaking.