I'm sorry that your question wasn't answered in a timely manner. I believe you're referring to a number of relatively common infections in the bulldog. A chin pyoderma is likely. This is a bacterial infection that isn't a true acne but rather is a traumatic furunculosis. The infection along the creases in his neck is called a skin fold pyoderma - again a bacterial infection. His swollen feet are likely to represent a bacterial pododermatitis - yet another infection. The blood-filled blisters are furuncles just as found on his chin but more dramatic and more difficult to manage.
Dexter may also suffer from allergies but infection should be our primary target at this time. Combinations of cleansing wipes, antibacterial shampoos, and systemic antibiotics will be necessary. Skin scrapings looking for an underlying demodectic mange, cytology (microscopic exam of a small sample of his skin surface) looking for abnormal numbers of both bacteria and yeast, and fungal culture should be considered in such a patient. Dexter needs a treatment plan that will manage his multiple skin disorders. Cure may not be possible particularly if there is an underlying allergic dermatitis (for which his vet appears to have prescribed Apoquel but much more needs to be done). I would consider having a specialist veterinary dermatologist look at such a patient. Please see here: rvc.ac.uk/small-animal-referrals/dermatology
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