sinus infections

Since I started my cpap, I have had sinus infections one ends another begins. I clean my machine. What else could it be. I use a resmed 9. Also I seemed to have developed allergies to something. I have never had allergies in my life before. Always sick, snotty nose cough, Need help! Thanks for reading

Are you using the humidifier? If so, at what setting?
If not using the humidifier...get one and use it.

Some people will experience allergy like/sinus symptoms if the humidity setting is irritating the nasal mucosa.
Some people need a lot of added moisture and some people need minimal to none added moisture.
If using a higher setting try turning it down. If using lower setting try turning it up.

Several years ago, I had a similar problem with back to back sinus infections. My doctor referred me to an allergy specialist. Once i got the allergies under control, the sinus problems got much less. Since having a deviated septum corrected, seldom have more than one sinus infection a year.