I agree with Wyorp Rock about cleaning out the solidified pus with a little peroxide, then cleaning out with QTips, and applying plain antibiotic ointment to smother any mites. There are some helpful older posts about ears by Dawg53 if you do a search for "ear infection in chicken" or Google that phrase. Respiratory infections, whether bacterial, viral, or fungal, and mites could be possible causes. Amoxicillin available online as FishMox, can be usefull in treating bacterial ear infection. Dosage in chickens is around 50 mg per pound of weight divided into 2 or three doses a day.
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