You've described a deep pyoderma which describes a surface or follicular bacterial infecition that breaks through hair follicles to produce furuncles ("boils") and cellulitis (inflammation of the tissue). Its development is often preceded by a history of chronic superficial skin disease and it is almost always associated with some predisposing factor such as the following:
Demodicosis (the mange mite Demodex), scabies, Pelodera (a nematode worm)
Hypersensitivity (e.g., atopy (allergies to environmental allergens), food, flea bite)
Endocrinopathy (e.g., hypothyroidism, hyperadrenocorticism, sex hormone imblance)
Immunosuppressive therapy (e.g., glucocorticoids such as prednisone, progestational compounds, cytotoxic drugs)
Autoimmune and immune-mediated disorders - a prime reason why biopsies are performed
Trauma or bite wound
I'd be happy to review the biopsy findings if you could upload a copy of the biopsy report to our conversation. You should ask for a copy of the report which usually arrives within 3 days of the biopsy being submitted. Please continue our conversation if you wish.