How the skin works
Our skin’s main function is to protect, separate, define us from the outside world, and regulate heat loss (via sweat and blood flow to the skin). But it’s not a completely impenetrable layer – it can also be absorptive.
Let’s look at the biology of the skin. The outermost layer of skin is actually a layer of dead skin cells called the stratum corneum, this is part of the epidermis.
The outermost epidermis is our barrier and has five sub-layers. It contains our skin cells (called keratinocytes), melanocytes, immune cells, and sensory nerves.
The main barrier of the skin is provided by the outer layer of the epidermis, the stratum
