The Human Skin is the outer covering of body. It is a largest organ in multiple layers that guards the underlying muscles, bones, ligaments & internal organs. Skin protects body against pathogens & excessive water loss. Its other functions are insulation, temperature regulation, sensation, synthesis of vitamin D and the protection of vit B folate. Skin pigmentation varies among populations and skin type which can range from dry to oily. Such skin variety provides habitat for about 1000 species of bacteria from 19 phyla.