Good morning my name isXXXXX and I wouold be more than happy to answer your questions.
How long have you noticed this on Ozzy?
Is the crusting on the outside of one ear or both, and brown or blackish debris in the ear canals? Have you noticed him scratching at the ears?
Please let me know when you are back online, he could have an ear infection and have the crusting due to him scratching at his ears, is he indoors or outdoors?