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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about Peaches especially since she hasn't been with you for very long.
I'd love to see the pictures you mention; the following link walks you through the process: http://ww2.justanswer.com/how-do-i-send-photo-or-file-expert
Thanks. These look pretty good, actually. Please give me time to type back a response for you. Thanks for your patience. Deb
This actually looks like a condition called Eosinophilic grauloma complex which might have also become secondarily infected (the yellow pus pockets).
This condition is usually secondary to an allergy of some sort although the source of the allergy isn't always easy to identify in every patient.
Most cats will respond to a combination of steroids and antibiotics although every vet may treat them a little differently.
It will be tough to treat this at home since she's likely to just lick off whatever you apply but you can gently clean the chin with dilute betadine or iodine (to the color of weak tea) which may help.
I'd advise having her seen since this may worsen if you don't...although some of these lesions will remain as they are without progressing.
I hope this helps. Deb
You're more than welcome.
Best of luck with her. Deb
Thanks for sharing the good news about Peaches.
I've seen a few cats who reacted to something in their environment with a swollen lip like this which then seemed to improve but usually these cats need medication for that to happen.
I'm glad that she appears to be one of those cats who didn't need drugs:) Kind regards, Deb
Sounds reasonable to me:)