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I'm sorry to hear of this with Bilbo. It's important not to apply lotions, creams, or ointments lest she ingest them while preening. Dilute chlorhexidine solution available in pet/feed stores is a very good antimicrobial safe in our pets even if ingested. Appying that solution twice daily to the sore will work in conjunction with the antibiotic to hasten resolution of the infection.
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