1
Skin & scalp
The barrier layers
Epidermis
Dermis
Sebaceous gland
Hair follicle
Sebum (oil) is produced in the gland
2
Oil + water
Sebum seals in moisture
Sebum
oil
Water
moisture
Balanced → healthy skin
Oil locks water into the barrier
3
Balance lost
Three common states
Dry
too little sebum / water
Oily
too much sebum
Dandruff
yeast feeds on excess sebum
Dandruff: yeast + excess oil → flakes