Lucifer Morningstar's character is shown revealing his true devil face on several occasions. It is a face that is at least frightening, if not repulsive for the average human.
Why is he the only angel to have this double face?
I know that he is the fallen one, sent to Hell by his father but I do not recall in the series an explanation being given on why his face was distorted the way it is.
Any Lucifer series (that would be fantastic) or comics (still great) explanations are welcome.
As a last resort, a reference to a religious text would be fine (although Lucifer's interpretation changed considerably across the centuries, making a link with Satan and, generally speaking, it is quite a mess)