Getting to the root of pyodermaMay 7, 2019Scaling, hair loss, papules, pustules, and epidermal collarettes. All are clinical signs pointing toward canine pyoderma. The culprit may seem clear at first glance; however, veterinarians must look at the bigger picture to address the underlining issue. It's important to first understand the meaning of pyoderma, particularly regarding the depth of infection, says Elizabeth Layne, DVM, Dipl. ACVD, clinical instructor at the University of Wisconsin-Madison, School of Veterinary Medicine. The most common form of pyoderma is superficial bacterial folliculitis, a bacterial infection of the upper part of the hair follicle, caused by Staphylococcus pseudintermedius. Deep bacterial infections (presented as swelling, nodular lesions, and oozing draining tracts) can occur, but that is a different diagnostic and therapeutic approach, Dr. Layne adds. Superficial bacterial pyoderma is almost always secondary to some kind of skin abnormality, such as atopic dermatitis. Other skin diseases (e.g. flea allergy dermatitis, sebaceous adenitis, or primary seborrhea) can also result in superficial pyoderma, Layne notes. Systemic illness or immune compromise may lead to superficial bacterial pyoderma as well. Since pyoderma commonly masks another condition, a vicious treatment cycle can ensue if the underlining problem isn't identified. "Veterinarians often recognize the signs of infection and treat with antibiotics …
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