system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Skin wrinkling after getting wet.

To expand on that, why do layers of skin peel off after the skin is wrinkled?
gpt
This is actually a fun bit of evolution!

First, let's talk about the ridges in your finger tips, the little guys that make up your finger print. If you didn't have those bumps, your finger would be all smooth, and it would be harder to grab things. The bumps make it easier to hold things, because your finger can conform better to what you are holding (in math terms, we would say your finger has an increased "surface area")

When your hand gets wet, it makes your skin slipperier. So, similar to how the ridges help, your skin reacts to getting wet by getting even more ridgey: they wrinkle up (increasing the surface area of your skin). This makes it easier to hold things when your hands are wet.

and as rmx_ mentioned, this response only happens if the nerves in your finger are working, which means your finger is wrinkling up because your brain told it to.