What is skin? epidermis(3)

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

Epidermis
Here are the layers of epidermis.
Stratum corneum/ horny layer
Stratum lucidum
Stratum granulosum/ granular layer
Stratum spinosum/ spinous layer
Stratum basale/ basal layer

Metabolism
The metabolism is the process of cell division.
Old cells move from stratum basale to stratum corneum with 15-30 days.
Then they stay at stratum corneum for 7-14 days. After that, the cells are in shape of fragments and escape from stratum corneum. The metabolism will spend 24-45 days roughly. 

From above, it will spend 2 weeks at least to see the effect of treatment.

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