Characters
Why do you wear a mask? Were you burned by acid, or something like that?
— Fezzik · The Princess Bride

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Fezzik asks for the reason behind a mask, then supplies a possible explanation involving injury. The second question makes the uncertainty explicit rather than settling it. The exchange gives a concrete hypothesis while leaving the wearer free to explain the mask in another way.
Context reviewed