I can sympathize with all the problems with masks and nose sores - I have the red mark on the bridge of the nose as well, after just 4 nights. I went to a new DME today, and he suggested that I am making the mask too tight. I'll try it tonight and give feedback tomorrow.


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SleepyToo
Philadelphia Area
Newly diagnosed, Respironics M Series Pro w\ humidifier
Zest nasal mask, also have Full Life ff mask, and FlexiFit 407
(Also have a FlexiFit 405 that damaged the bridge of my nose)

I'm so sorry that you're having this trouble.    I hope that they can get whatever the problem is around your mouth healed soon so you can try on new masks.  I know your frustration since I too experience soreness with my nose at first but of course did not have your other issue.   I was able to use Vaseline and KY gel to help the inside and bottom of my nose but did not have open sores.  
Once you do heal up and get cleared up...try the nasal pillow.  It may just work for you!
Here's hoping for your quick healing!  
Angela

Ah yes, the pressure sore from the pressure of the mask.  My loved Profile Lite gel did that to me after 2, maybe 3, months.  Still have the indent.  And, I agree, if I wear a mask right at the top of my nose, then the sides are in my eyes.  Right now, I'm alternating between the profile lite, and 2 others (mostly the 2 others, as 2 nights and then I need to change masks before I have the pressure sore again.  The other 2 aren't as heavy as the profile lite, also not as comfortable.

Hope you find a resolution to your problem.

Sheryl