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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
How often does this occur? Does it seem to be seasonal?
The picture looks very typical of a deep pyoderma. Pugs can be prone to this and it can often be difficult to tackle. Has she ever had any swabs of her skin for bacterial culture?
A swab is to try and culture any pathogenic bacteria that may be better targeted by specific antibiotic therapy. A biopsy is to take a sample of the affected tissue to try and identify any disease process going on in the skin there. The two are different procedures.
What antibiotic treatment has she had so far?
How long a course has she had?