Dermis: The cell in this layer only grow up, never donw. As a result when the cell is divide, the newer cell is always on top. This process always turns into the new generation. All this process it's pushed all the cell up to the surface and also takes about two wweeks for newly cell to be pused tothe suface.
Epidermis:The ver outermost layers of skin are stacked atop one another like shingles on a roof. After all the the cell flatten out, mixed with Ceramideds and other lipids connct them to one another