The pterygium is a triangular lesion that extends from the conjunctiva to cornea.
This lesion is due to benign growth of connective tissue and conjunctival vein tissue.
The pterygium usually develops as a white on the conjunctiva, which gradually grows toward the cornea. Because of the large veins pterygium is usually pink or red. The pterygium can sometimes become inflamed, causing itching and tingling and foreign body sensation.