So happens that when I caught COVID, one of the symptoms I had was diagnosed as psoriasis. Like you, it was inside my ear canals, plus behind my ears + soon migrated down the back of my ear lobes to the to of my neck. I got it in a few other areas too.
These dermatology conditions are autoimmune based. They are known to be associated with the effects of the COVID virus.
Sorry to hear you have this. But realize it's more than a skin problem. It reflects an autoimmune problem. Ditto for all your new allergies. Same here. Although I had allergies prior to the virus.
Hope you can manage this soon and effectively.