Hi Min93,
It is suggestive sign of inflammation. Redness, swelling, pain and hot to touch are the cardinal signs of inflammation. Once you observed these, refer immediately to your veterinarian for appropriate treatment. Inflammation can be an initial sign of infection and antimicrobials may be administered.
For other related information, please visit and talk to our Pet Care Consultants in all our PLC outlets. For veterinary medical treatment, refer promptly to your veterinarian.
Best regards,
Eliezer M. Bauzon, DVM RN