Why do only fingers and toes go wrinkly in the bath and not other parts of the body?

Answer 1

Because the hands and feet have the thickest layer of dead keratin cells. The dead keratin cells absorb water. This absorption causes the surface area of the skin to swell, but the outer layer is tightly attached to the living tissue. So, to compensate for the increased surface area, our skin wrinkles.

Answer 2

"The tips of fingers and toes are covered in a tough, thick layer of skin which, when soaked for a long time, absorbs water and expands. However, because there is no room for this expansion the skin buckles, hence the wrinkles."

Answer 3

Hmmmm, you must not be a guy...