1-1.Basic knowledge of skin
	●Defense and encirclement The skin covers the surface of the entire body, and prevents a necessary material in the body being lost at the same time though it defends so that neither stimulation, an impact from the outside nor a harmful material may enter.
	For instance, the hot water of the bath is infiltrated to the inside of the body when taking a bath and it never blisters. This is because working that the horny layer prevents water being infiltrated is done.
	●Secretion and excretion Sebum gland that exists in the skin secretes the resin (sebum) along pores on the skin surface. On the other hand, the Ecrin gland is sudoriferous from the sweat opening. Most of the sweat is water, and salinity etc. are slightly included.
	●Adjustment of temperature The skin is a heat radiation organ that can have been had very well. The circulation of the blood improves when a lot of capillaries distributed in the skin thicken temporarily and heat is discharged. It deprives of heat of vaporization when the sweat evaporates oppositely, and the surface of the skin is cooled. The best role of the sweat is this temperature adjustment.
	●Perception The network of the nerve is abundantly distributed in the skin. The touched feeling (sense of touch), warmth, heating (hot　sense), cold (cold sense), the pain (feel strongly), and the pushed feeling (Ocan) are told through the skin.
	●Health of skin　　　　　　 The skin is said, "Mirror of internal organs", and projects the state of the person's body. The body is thought to be healthy with a beautiful skin though a superficial thing is paid attention easily when an elastic skin in seeing and no beautiful touch is beautiful. as the firstIf sleep and the rest are good the state of nourishment, and satisfy enough, are also appropriate the movement and the workload, and mentally and physically filled, the skin looks beautiful.
	●Condition of beautiful skin　　　　　　 A beautiful skin is smoothly elastic, and there are not only the fair skin but also some elements. There is enriching in the surface, and it is smooth. It is elastic to the skin and there a delicacy softly. The blood circulation is good, and the complexion is good.