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Hello, I am Dr Ola B and I am a licensed veterinarian. The inside corner of each eye you are describing is known as the nictans membrane or "third eyelid". When both eyes have a swollen third eyelid, it is due to allergic conjunctivitis or viral/bacterial conjunctivitis usually with an upper respiratory infection. First thing hong is to determine if your cat has nasal discharge or experience any sneezing or wheezing? If no nasal discharge or if you have nasal discharge and the discharge is clear, allergic conjunctivitis is more likely. In this case, an anti-histamine can be prescribed by your veterinarian. If nasal discharge is yellow or green in color, this indicates infection which most often affects the conjunctivita in the eye and the reason the third eyelid is elevated. Your kitty may also have decreased appetite and energy too. Also, when the 3rd eyelid is elevated, this is usually associated with inflammation which can cause corneal ulceration and other secondary issues. Because of this, I would recommend your kitty see his regular vet for an appointment where he/she can exam the eye closely and possibly apply a stain to rule out any scratch or ulcer in the cornea.
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