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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about Ceci's situation. Can you take a picture and post it?
I will be on and off here all day. That isn't a problem at all. This most likely isn't an emergency situation as long as he's otherwise acting normal. If he's bright and alert, eating well, comfortable and not seeming distressed that is. If these were to change, then getting him seen here ASAP would be a good idea. This area that you're seeing could be an area of infection or a growth. I wouldn't be super suspicious of the other cat and him wrestling to cause this.