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Here we see the normal
hair follicle. Sebum is produced by the sebaceous gland and
passes up the hair follicle and onto the surface of the skin
where it acts as a waterproofing agent.
Normally there is a wide opening
to the hair follicle and the sebum can easily pass onto the
surface of the skin, as a small quantity of sebum is produced
the skin does not feel greasy.
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