Ear debris or discharge could indicate that your cat has an ear infection or parasites such as ear mites. If this is not fixed appropriately, the eardrum may be affected. It’s also very uncomfortable for your cat.
Skin irritation or hair loss could indicate allergies, external parasites, or another skin problem. It’s also possible that it’s painful or irritating. Don’t put your pet through pain and distress. Your veterinarian may be able to advise you on treatment alternatives.