1-3-3.Change in amount of sebum secretion
	Relation to hormone ●The amount of the secretion of the sebum is ruled by the male hormone. Naturally, the man increases than the woman and the amount of the secretion increases. The woman is the one with the male hormone of the adrenal skin quality origin, and the amount of the man of 85%. However, the sebum secretion tends to increase before the menstruation because the progestin which is a kind of the female hormone actively does the sebum secretion. ●皮The secretion of the sebum is promoted with the male hormone, and controlled with the female hormone.
	Relation to age ●The man and woman and it is from 16 that the activity of the sebum gland becomes active to 20 years old. Afterwards, it decreases gradually, and it begins to decrease at the climacteric period greatly. It is transitory, and it decreases gradually though the man promotes temporarily even at about the age of 50 occasionally.
	Relation to season ●The secretion increases from spring to summer when seeing at the season, and it decreases from autumn to winter. However, a seasonal change is not seen so much by the indoor air conditioner in the home and the company because it lives in a constant temperature recently either.
	Amount of secretion during a day ●The amount of the secretion of the sebum during a day is often influenced from about one by the individual variation and the life side though is 2g. There is no sebum because of being always constantly secreted. When it reaches a fixed amount, pressure is applied to the sebum gland and it comes to suppress the secretion.