system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] At what point in time did Voldemort start looking like that?

It seems like there are a couple possibilities for how he started to go from being a handsome young man to a bald, white, noseless snake-monster-man. Was it when his body was rebuilt in GoF? Like prior to that, was he just a guy but then he got a new body and it looked like a monster?

Or did he slowly turn into a snake man over time? Perhaps as his soul got splintered?

Or did he alter his appearance himself to look more intimidating?
gpt
Use of dark magic seems to have something to do with it, and there is little doubt something as perverted as creating multiple horcruxes would contribute to this.

Dumbledore noted his appearance seems to have been altered by some extent by the time he applied for the Defense Against the Dark Arts teaching position, which was after his decade or so of traveling (Dumbledore also suspected that Voldemort cared little for the job simply used the opportunity to hide a Horcrux in Hogwarts). Nothing is mentioned of a snakelike appearance while he worked at Borgin and Burkes preceding his disappearance, and in fact he is still described as handsome at the time.