The outside of my daughter nostrils gets irritated from the HTS 7%. we use a mask when we do nebs for her sinuses. She had a little scab right on the skin outside her nostril, looked ouchy. So I gave her nose a break and we used the mouthpiece for a few days while doing nebs. looked all healed up after that so I put her back on the mask and now she has an irritated area in a different spot on the skin right outside her nostril. So I plan on switching her back to the mouthpiece again. Anyone have this problem? I like the HTS by mask, she hasn't had a sinus infection since we started doing it this way. What do you all think? Maybe do the HTS by masks every other day? Suggestions, welcome.