This is a protrusion of the lacrimal gland that it is located below the third eyelid, or nictitating membrane, and it manifests itself with the presence of a lump or swelling in the internal angle of the eyelids. Sometimes this appears in just one eye, and sometimes in both eyes of the pet.
The original cause is not well established, although it is presumed to be the consequence of a chronic irritant factor that causes an increase in its size and eventual displacement. It can occur in any breed of dogs and even cats, although it is most often seen in brachycephalic breeds or short snout dogs.
The solution of this pathology consists in the surgical repositioning of the protrusion, while making sure that it will stay anchored perfectly at the deep end of its original location. Its elimination is not recommended as this could result in a deficiency in the lubrication of the eye with harmful effects.