My 15 year old mixed breed cat has developed a non-squishy bubble on his bottom lip over the past month.

This swelling does not hurt as evidenced by him pushing into my hand as if petting himself when I touch it. He is very healthy despite his age.

We've taken him to the vet and she gave us the option of sedation and a biopsy, scheduling surgery to have it removed immediately and having a biopsy on the entire mass after removal, or watching it and bringing him back for surgery if we see it grow larger. She says that it is not "rodent ulcer". We took him home and are keeping an eye on things since we don't want to put him through the stress of sedation, surgery and recovery if it could be as simple as an ingrown hair or something benign that will not bother him.

We are watching him closely and taking photos to compare any change.

Thank you for sharing any thoughts you may have. I can send or post photo.