Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
There are certainly several possible causes for a flaky hairless area on the skin. The malaseb shampoo is excellent. This area could reflect a focal ringworm (dermatophytosis) lesion or it could be a focal bacterial infection (that is not responsive to malaseb) or it could be a focal mite infection (particularly demodex which is not itchy). If you have monitored and treated this for a while, and are not seeing improvement with the shampoo then I must recommend you take her in to be seen by her veterinarian. If she was my patient I would recommend performing a skin scraping that would look for mites, bacterial and yeast infections. If this was not seen then I would recommend do a ringworm culture and while waiting for those results (takes 2 weeks) treat topically for ringworm. Of all the possibilities my top two concerns are mites or ringworm.
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