Because he's face is deformed (has been from birth) and he has to hide it from the world that has hated and abused him for that deformity. Christine thinking he's her Dad has nothing to do with the wearing a mask and she doesn't even think he's her Dad anymore after first seeing his face. It was only during the time he was nothing but a voice of "an angel" in her world.
It depends on what form of the story you are looking at.
In the book the creator by Gaston Leroux, it was birth defect, he was taught to wear a mask at an early age
In the 1925, with Lon Chaney the Phantom's face was a severe aging process, he must hide his face.
1943, Claude Rains' Phantom's face, someone throws acid at him, he must wear must to hide the pain.
In the Andrew Lloyd Webber the stage musical, he wears a mask to hide his face, because it is deformed due to a birth defect.
In the movie Andrew Lloyd Webber the musical, The Phantom of the Opera, he wears the mask because gypsies tortured the Phantom at an early to adult age.
The Phantom of the Opera written by Gaston Leroux. The Phantom does not have any hair, it had fallen out either by cruelty of the gypsies or poor health problems. He wants to appear healthy, attractive, mysterious to Christine, not his true appearance to her, for fear his true appearance would only scare her to death.
He was tired of himself. He wanted to change. He was done hiding. He was ready to go out into the world and bravely show the world his face.
There is a bent metal wire that runs from the forehead "tip" of the mask to above the right ear. It sits on almost like a helmet.
Gaston Leroux the created of the Phantom of the Opera, describes Erik's face as a severe illness from the time of birth.
Scars on his face from beating while a circus attraction
When Christine rips off his mask. he dose not take his mask off willingly.
Slo Down The hip hop group is called St. Lunatics.
Blink-182 did a cover of the Phantom of the Opera.
The 1800s
Phantom of the Opera was credited to Andrew Llyod Webber
The Phantom has a mask to hide his scarred face, so he will not frightened anyone.
Its a mask that covers the eyes
I wish i had his mask. And his girl.
Behind the Mask The Story of 'The Phantom of the Opera' - 2005 V is rated/received certificates of: UK:PG
Accordingly to Gaston Leroux who had written the original Phantom of the Opera, the Phantom is wearing the mask to hide severe scars from birth so when people see his face they will not draw back in fear thinking he is a hideous monster. (I know this not answers that you are hoping for. Please Read Gaston Leroux's Phantom of the Opera, his book will answer your questions about the Phantom wearing the Mask.)
The original mask of Lon Chaney who was first to play the Phantom of the Opera, Is most likely at Smithsonian Museum at Washington DC. Sir Andrew Lloyd Webber's Phantom of the Opera, Is most likely own by Sir Andrew Lloyd Webber.
Maria Bjornson, she had designed the original Andrew Lloyd Webber's Phantom of the Opera.
He is wearing a mask that covers half of his face.
When Christine rips off his mask. he dose not take his mask off willingly.
Masquerade. People wore masks like that to dances.
if your talking about the newest version, it is made out of a very flexible leather.
i suppose a tuxedo and a phantom of the opera style mask ( a plain white mask that covers all of your face but cut in half verticaly)