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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
This is surely going to be an underlying allergy. Allergies can lead to recurrent skin infections. These can be bacterial or fungal (yeast). It's the fungal part that smells really bad.
Things like antibiotics, anti-fungals, steroids and Benadryl can help the signs. You really need to get to the bottom of the allergies if you want to stop it from coming back.
To diagnose allergies, you do skin allergy testing. This is usually with a veterinary dermatologist. From there, you make a serum of diluted allergens that you inject or give under the tongue at a slowly increasing amount. This de-sensitizes the body to allergens. It's called allergy immunotherapy.
In the mean time, you can use topical soap/ water. Something like dawn dish soap would be fine. I would not use bleach on the skin anymore. You can also use Benadryl for itching at a dose of 1-2 mg per lb body weight every 6-8 hours.
Here is some good information on allergy immunotherapy to read over before going to a dermatologist:
I hope this helps, let me know if you have any other questions.
Ok, just making sure!