What is skin?(5) lipid in skin

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The skin has three layers. They are epidermis, dermis and subcutaneous tissues

Epidermis

Lipid in skin
Sebaceous gland is from the stratum bassale to stratum corneum. It will excrete the lipid which is among the cells in epidermis to prevent the skin too dry. The lipid will start to flow at 15-170C and melt when the temperature is higher than 340C. The skin will excretes more lipids in summer and should be cleaned to reduce the burden of skin.

lipid
Average (%)
Triglycerides
50-60
Wax esters
26
Squalene
12-14
Free fatty acids
14
Mono and diglycerides
5-6
Sterols esters
1-3
Sterols
2
Fatty alcohols
2

Why do we concern the substances of lipid?
Because cosmetic industry hopes cosmetic products to simulate the functions of lipid.

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