In Harry Potter and the Chamber of Secrets, it is shown that Voldemort is Tom Riddle who is actually a handsome fellow. But in the next movies, we see that Voldemorte's face becomes weird / hideous. Why does it happen?
Is it because of the Horcruxes? Or something else?
According to the Harry Potter Wikia:
While working at Borgin and Burkes, Tom befriended Hepzibah Smith, a wealthy but elderly descendant of Helga Hufflepuff. Between 1955 and 1961, Hepzibah showed Tom her two most valuable treasures: his ancestor's locket and her ancestor's cup. Tom's eyes flashed red with greed and avarice upon seeing these objects and he desired them, because he saw the locket to be rightfully his as Slytherin's heir and the cup was a reminder of Hogwarts as well as a priceless artefact. Tom killed Hepzibah to steal these coveted objects and vanished without a trace.
[...]
Tom disappeared for ten long years. He slipped deeper into the Dark Arts, travelled extensively, consorted with disreputable people, began to become distorted in appearance and lost his handsomeness, due to splitting his soul so many times, and began to use the alias "Lord Voldemort" openly.
No, it was because he made spells to change his appearence in order to be a distinct figure in the magic world and he also did not want to look like his hated human father and his weak mother.
