my cocker spaniel has this blister on the snout ( picture attached) he had one blister near chin and I was prescribed CefPet tablet and Kiskin ointment I have used them for 5 days and blister has reduced however I see another blister on the snount now may I know what is the issue ? Should I continue same medicines for week again or change medicines ? Please suggest! Thank you.
English Cocker Spaniel, 10 months old