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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
Hi Wayne! I am sorry you are concerned about Ollie. Where on his body is the blister?Can you post a picture of it here?
If it is an open wound or blister, it should heal. The Neosporin is a good idea; just keep him from licking for a few minutes after you apply it so it can be absorbed.If it won't heal, there may be something in the hole that needs to come out, such as a splinter or foxtail (grass awn).
Can you send a picture of it? How big is it?I saw a cat recently with what looked like an open sore on her side that would not heal. It was an "eosinophilc granuloma" and healed up completely once we started her on prednisolone. We don't know why cats get these lesions, but they usually respond to steroids.
It won't really help and most cats just pull a bandage off. If you want to cover it you have to shave off the hair, so it will stick, but in my experience covering it does not help it heal faster.
If it is an eosinophilic granuloma, it won't heal until she is started on steroids.If it is an infection, I like mupirocin ointment but that is a prescription. It is safe to continue the Neosporin; if this is a wound or an infection it will heal. If it is an eosinophilic granuloma, it will need prescription medication.
Please let me know how he is doing and if you have any other questions.