Swelling around cats mouth?

Hi all

My Chanel is 9 years old. She is very active, she has been eating normally, she gets plenty of sleep, she is always very alert, etc. Today, I noticed a bit of swelling/bumps around her mouth. The area is a bit of pink/red and appears to be affecting one side of her mouth more than the other. The few bumps she has sort of look like pimples. I have heard of cats sometimes having acne, but this just looks a little too extreme to be acne. Could this possibly be a disease or maybe even an allergic reaction?? I am extremely worried and am curious as to whether or not i should take her to the vet immediately.

I have attatched some photos. I apologize if they aren't the best of quality since she wouldn't hold still. (: Chanel hasn't been acting abnormally, nor does it seem like the swelling bothers her (but cats are great at hiding pain!). I appreciate all and any responses on how i should further take care of this, thank you!!
 

That's very interesting, especially if she's never had anything like this previously.  It doesn't look like feline acne, but more like a bug bite or maybe a reaction to something.  Is there anything she could've gotten into?  It could even be litter allergy if you've changed litter recently or used anything on carpets.  I think I'd get her to the vet.

PS~She's a pretty tortie girlie!  I'm partial to torties and have one myself.