8-1.Cause of wrinkle：Ultraviolet　rays
	Cause of making wrinkle ●If elasticity and the beam of the skin are lost, slack is caused and it becomes a wrinkle. The moisture retentivity of stratum corneum decreases, the skin is dried, and the cause of temporary poor nutrition etc. is thought, and the first stage of generation accompanies progress and reaches even dermis by depth. Collagen and Erastin decrease and the elasticity of degeneration and the skin decreases. These various elements are intertwined and the wrinkle is generated. Moreover, it is not only an inner cause and various causes are thought by aging externally.
	Ultraviolet rays ●Bathing in ultraviolet rays too much promotes the degradation shrinkage of collagen and Erastin. It is seen to ultraviolet rays wrinkly in around, the breathing in face, and the hand, etc. because of ultraviolet rays. When going out because early aging will be caused, a young, excessive sunburn sticks one's cap on one's head, uses the sunscreen, and avoids ultraviolet rays positively as the parasol is done.