What is a Pterygium? - American Academy of Ophthalmology

The pterygium (pronounced "terigo") and pinguecula are growths or tumors on the cornea (the transparent front window of the eye) and the conjunctiva (the thin, transparent membrane covering the sclera or white part of the eye). These tumors are non-cancerous and quite common.

The penicillin (above) is a yellowish patch or bulge in the conjunctiva near the cornea. It most often appears on the side of the eye closest to the nose. It is a change in normal tissue that becomes a deposit of protein, fat and / or calcium, very similar to a callus in the skin.

The pterygium is a growth of fleshy tissue triangular in shape on the white part of the eye, which over time can extend over the cornea. This tumor may remain small, or grow large enough to interfere with vision. Often, a pterygium develops from a penguin.

What is a Pterygium? - American Academy of Ophthalmology

Some pterygium can become red and swollen and some can become large and thick, producing a foreign body sensation in the eye. If the pterygium is large enough, it can affect the shape of the surface of the cornea, causing astigmatism.

The causes of pterygium and pinguecula development are not yet clear. It is believed that the ultraviolet (UV) light of the sun may be a factor in the development of these tumors. Other factors believed to cause pterygium and penicillin are dry eye conditions and environmental elements such as wind and dust.

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