BCI can't breath from nostrils

[Roargathor]

I have a 7ft male BCI about 7 years old. Today he's exhibiting issues breathing from his nostrils. I was worried it could be a URI, so I checked his mouth. There's no extra saliva or discoloration of tissues. It seems to be just his nostrils. No discharge, gurgling or bubbles that I can tell.

This started fairly suddenly as my housemate took him out for some handling, he was out for about 30 minutes before he started huffing noticeably, and opening his mouth to breath. He has never bit anyone or become noticeably agitated when being handled. Always super sweet and docile.

He shed last week, so perhaps his nostrils didn't get all the way clear, but I let him soak in the tub for a bit to try and moisten things in hopes whatever was blocking the airways would dislodge.

Anyway, just checking if anyone here has experienced this. His enclosure is 90-95 in the warm side, and 75ish on the cool side. There's fresh water in a large bowl for hydration and humidity, and he's had no issues with this set up his whole life. The substrate is "repti-bark" and cocoa fiber mix.

Thanks for any info.