Corpse them. Basically it is plastic bags or Saran Wrap heat gunned onto them and then painted with several shades of spray paint to achieve that flesh look. Just search for corpsing for more info. I have watched it done, just never done it myself.--except on the Rising Spirit creatures where it is wrapped around bend PVC pipes to look like skin
Also, if those hands are fleshy, like severed limbs: paint them a dead flesh color. Not nice and pink, but several shades lighter, and yellower. Think like almost chicken skin. Then take a sponge with bruise purples, and reds and b even black and brown in successive passes and lightly stipple discoloration around the cut off edges. Don't forget to discolor the fingernails too!
I found this hand on Deviantart. It's a pretty good example.