Red Superfly
You creepy little stalker
Oh come on. I can't believe people STILL think Palpatines face melted.
It was a mask. Old and wrinkly is Palpatines true form. THAT's what he naturally looks like.
One theory I like is that Palpatine was holding on to his youth via unatural means.
I mean, he could have been over a hundred years old, but because he tells Anakin about the theory of people being able to prolong life via the darkside adds weight to the theory.
Palpatine was simply prolonging his life. When he was attacked, he dropped the ball, and because he could only prolong his life, it was impossible to revert to younger Palpatine form.
Maybe it was because the lightning caused a lack of focus, or maybe it was because the darkside drained him.
There's more to it than "he got teh lightningz scarz0rz in teh face".
There can only really be theories, but the one theory that simply CANNOT be true is that his face melted. Not only do the physics (even for STar Wars) make no sense whatsoever, force lightning didn't do anything to anyone else, so as far as EVIDENCE goes, we can sum up that lightning didn't burn/disfigure Palpatine, and therefore it shouldn't burn/disfigure anyone else.
I really don't see why you are all looking for one simple explanation. There isn't one. It is really quite shocking how stupid people can be. Star Wars may be fantastical, but it doesn't ever go as far as to suggest lightning melts someones face, makes their eyes red and teeth decay.
Can I buy some pot off some of you?