Uglies.

About Uglies

Uglies is a 2005 dystopian science fiction novel by Scott Westerfeld. It is set in a futuristic post-scarcity world in which everyone is considered an "Ugly" until they are then turned "Pretty" by extreme cosmetic surgery when they reach the age of 16. It tells the story of a teenager, Tally Youngblood, who rebels against society's enforced conformity after her friends Shay and David show her the downsides to becoming a "Pretty".