This is the sort of thing which is a lot easier to do manually using a sculpting tool then any automated system you could use. The reason is that human skin doesn't behave in a nice homogenous 'dynamic' fashion as it gets pushed around by cloth, bones, tendons, fat and skin-skin/skin-object collisions. Just compare how the webbing between your fingers moves with finger movement to say rolls of fat on a belly to the 'crushing' behavior of something like an ear etc. Then add to this the fact that as skin ages, its behavior also changes, becoming looser, more prone to wrinkles, less defined ... and you can how much of a nightmare this sort of thing is to automate. Even in big budget, high end production, it's done case by case with customized rigs for each character.

Much easier to just pose your character, get a reference photo of the pose (or the closest you can google) and add the various skin deforms using ZBrush or even something like the morph brush IMVHO.