Looking puffy

I like Norman Reedus so I'm not trying to insult him. I noticed, especially in the last year or so, that his face is looking really bloated & swollen. His eyes are so puffy that they are almost swelled shut into a tight squint.

Is he having a medical condition I'm not aware of? Maybe he's on Prednisone for a condition or, hopefully not, drinks heavily? It doesn't seem like simply weight gain or age.