I have just been diagnosed with mild apnea, and started using a full mask with humidifier. Having a real problem adjusting and the main thing at this stage is the nose itching, outside of nose, not where mask touches skin.
I talked with my rep for the machine, and he said it is from a bit of condensation in the mask.(like if you are in the bathtub, and touch your dry nose it inevitably starts to itch until its wiped away or when it dries.) The condensations can be just from your breath and or the humidifier.
I changed the settings on the humidifier, to the lowest, but then my nose and even eyes felt really dry. I give up and take the darn thing off!!
To me it is a no win situation, and I think I will have to try the nose pads.