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Hi I'm Dr. Carole and I'm a small animal veterinarian. Sorry to hear about Bella. Poor Bulldogs, they get their share of skin problems. Dogs can get yeast (fungal) infections on their skin commonly. Usually caused by an organism called Malassezia. It may need to be treated with oral antifungals like fluconazole or terbinafine. Shampoo does help but it needs something like miconazole or ketoconazole in it for the fungus. Dogs can also get bacterial infections on the skin that can make it red. Antibiotics are used for that. A test called a skin cytology can be done to diagnose both. That is where you take a glass slide and touch it to the skin then look under the microspcope. You can see both yeast and bacteria that way if it is there.
Often these infections are caused by allergies (food, atopic dermatitis) so in order to fully treat I recommend a product called Apoquel. It works well to control the redness and allergies. I suspect allergies because of the concurrent ear problems.