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.
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.
herepes.
caruncle
The conical body in the medial corner of the eye is the lacrimal caruncle. It is a small, fleshy mass that contains sebaceous and sweat glands, as well as hair follicles. Its main function is to produce a small amount of tears to keep the eye moist.
From the Corner of His Eye was created in 2000.
i would because you dont know what it is and if its harmful
Corner of the Eye was created on 1995-05-19.
The small bone located at the corner of each eye that contains a fossa for the tear gland and canals for the passage of the tear ducts is the lacrimal bone. It helps in the production and drainage of tears to keep the eye lubricated.
The ISBN of From the Corner of His Eye is 0-553-58274-7.
Trauma to a guinea pig's eye can cause a condition called hyphema, where blood leaks into the eye's anterior chamber. This can make the eye appear white or milky due to the presence of blood. It is important to seek veterinary care if you notice this symptom in your guinea pig.