Skin shaders

Ok, first of all hello to everyone that is reading this! For a past couple of hours I was trying to find a tutorial or some sorts of documentation (good documentation) on skin shader and how to make skin look realistic. I know there is section in UE4 documentation but that seams to me superficial and not in depth enough. So can anybody tell me where to start or can anybody share there experience whit this topic :slight_smile: