There are creepy crawlie thingies all over and everywhere - even you eyelashes!. After a decade of use - a pillow's weight is half in bug corpses. That's why really old pillows are so heavy.
Dust mites can also cause nasal polyps growths within the nose.
You know that lovely image of Santa's reindeer? Well in Lapland, in the summer the mosquitoes are so thick that people wear mesh masks. The reindeer's head has huge sinus cavities and blow out like a bucket full of snot infested with infected mucus from the mosquitoes.
Oh yeah google images with the words 'parasite' & 'eye' to see a whole bunch of gross pictures of eye worms!!