Pingueculum is a yellowish bump on the white of the eye, most often on the inner part near the nose.  It is not a tumor, but a mix of altered normal tissue. It may be a response to chronic eye irritation or sunlight.  It usually does not grow onto the cornea or threaten sight.  No treatment is indicated unless it becomes inflamed.

Pterygium is a fleshy growth that invades the cornea (the front window of the eye).  It is commonly located on the inner corner of the eye.  It occurs more often in people who spend a great deal of time outdoors, or those with chronic eye irritation from dry, dusty conditions.  When a pterygium becomes red and irritated, eyedrops or ointment can be used to reduce the inflammation.  However, if the pterygium is growin or interfering with eyesight then it can be removed surgically. Despite proper surgical excision, the pterygium may return, particularly in younger patients.  Surface medications and grafting from non-sun damaged part of the eye are often used to help prevent recurrence.  Sun protection, ocular lubrication and avoiding environmental factors may also help.