In humans, skin pigmentation changes among populace, and skin type can go from dry to slick. Human skin pigmentation differs among populace in a striking way. Such skin assortment gives a rich and differing living space for microscopic organisms that number approximately 1000 species from 19 phyla, present on the human skin. The thickness of the skin fluctuates extensively over all parts of the body, and among people and the youthful and the old.