system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why does the Emperor's face get all messed up?

Palpatine goes from looking like a fairly regular old man to a hideous wrinkled monstrosity after using force lightning on Mace Windu. Why?
gpt
It's because the dark side of the force corrupts not only your soul, but your body. There is a reason why most Sith lords have pale skin or have massive scars. 

Also, Palpatine never really got burned by it. He wore a force mask to hide his appearance. That was burned off, not his face like some are lead to believe. He just wanted evidence that the Jedi "assaulted" him.