Please take him/her to the vet. Eye infections can progress very fast in different species and can harm or blind the animal permanently if left untreated. There is nothing you can buy "over the counter" that is safe to use in this case as the medication is only prescribed by the vet.
Sounds like a stye
Cherry Eye Disease is something only dogs. The disease starts out appearing as a small red bump that sticks up above the third eyelid and is located in the corner of the eye nearest the nose. Cherry eye is actually caused by an inveted nictitans gland.
caruncle
herepes.
Guinea pigs sometimes get small bits of hay in their eyes and this is not harmful unless the hay is stuck in the corner of the eye. Larger pieces of hay could hurt the guinea pigs eye.
From the Corner of His Eye was created in 2000.
i would because you dont know what it is and if its harmful
Belugas are white with a small little tincy weency eye in the corner of there head.
Corner of the Eye was created on 1995-05-19.
Pinguecula and Pterygium
The ISBN of From the Corner of His Eye is 0-553-58274-7.
The lacrimal caruncle is the conical body in the medial corner of the eye. It contains glands to moisturize the eye.