You see, the epidermis has no blood containers. https://ruamataz.net/kem-chong-nang-loai-nao-tot-top-10-kem-chong-nang-toan-dien.html is only nourished through diffusion from the dermis also to a certain extent by sebum. The skin contains five sub-layers, so the outermost probably doesn't acquire a lot of nourishment. And, that's the layer in which see.
