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How long does Benny have this trouble?
Is he able to eat with his lip that way?
Is he an indoor kitty?
After your reply please give me a few minutes to type detailed answer or if you wish, we can speak on the phone
I was hoping to hear back from you so we could talk about Benny. I will send you some information and you are welcome to reply anytime.
He may have banged or hit his lip. Apply a cold compress 5 minutes on and ten off for an hours. If you use ice put a towel in between so its not directly on his skin.
If he has sore, dab on a bit of raw honey. It is safe to lick and will heal it right up.
Other possibilities are an eosinophilic granuloma or a herpes sore (not contagious to people.
Please let me know how Benny is doing. I hope he feels better very soon.