I had a problem with sinus stuffy, which turned into sinusitis. I thought the CPAP was the problem, but it was really the extremely dry air in the house. Turned up the humidifier on the machine, started flushing sinuses with sterile saline, followed by Flonase, and all is well.
Tried nasal mask (wisp) as well as Quattro pro full face, but settled on nasal pillows. (Nuance Pro, and Swift FX). Great for side sleeper, and now I even forget I have them on.
Thanks to all on the Board here. When I had a question, I used "Search," and invariably found an answer.