I have used the N10 Nasal mask for years with no problems. I understand this mask has been discontinued and had to go with the N20 mask. After 4 days of use, the mask has worn a blister on the bridge of my nose. I have loosen the mask as much as possible to keep an airtight fit and still doesn’t help. I guess I need to try the Nasal pillow nasal mask now.
Chip Miller