Who is that Masked Man?

Eli has been coughing so much we decided to fight for a doctor's appointment (no easy feat under TRICARE). When Kristin and the children arrived and began to describe his symptoms, the doctor's eye 'bout jumped out of his head (pardon the technical, medical language) and he herded them off to an "isolation room". Two REAL doctors (as opposed to a PA or an intern which is common) put him through a 2-hour series of test. The diagnosis..."beats me". One says whooping cough. Another thinks pneumonia. That M.D., instead of prescribing Codeine, recommended beer or strong whiskey (I like him).

When he's not barking like a trained seal, Eli is actually fine and energetic. And he rather likes his mask. So far, the only other family member that sounds like him is the dog, and that's normal. But she has launched several attempts to steal the blue mask.
The Masked Man