Why did Bane wear a mask?

Why did Bane wear a mask? Bane is someone ravaged by pain from a trauma suffered long ago, and the mask dispenses a type of anesthetic that keeps his pain just below the threshold so he can function.

Bane is someone ravaged by pain from a trauma suffered long ago, and the mask dispenses a type of anesthetic that keeps his pain just below the threshold so he can function.
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