My Cat Has Swollen Upper Lips. Candy r., veterinary technician replied 10 years ago. However a few days later the right side of his top lip became even more.
The allergic reaction activates the eosinophils, a special type of white blood cell. However a few days later the right side of his top lip became even more. If you notice your cat has a swollen lip, check for other symptoms the feline might have.