it could travel, see how far down you can see into the ear and see if there is anything. If there isn't anything that means its at the very base of the ear wich you cant see. Try to get the azithromycin as soon as you can. I think you have a Costco there if so message your vet and see if they can get it prescribed to you through Costco. then you will have it for sure and it could be cheaper.