A pterygium is a fleshy tissue that grows on the clear front covering of the eye called the cornea. A pterygium usually, but not always, appears on the inner corner of the eye. Sometimes it will grow large enough to interfere with vision. Pterygia tend to occur in people who are frequently in the sun. Long-term exposure to ultraviolet ray and chronic eye irritation from dry, dusty conditions seems to be another factor. If a pterygium begins to irritate the eye, your doctor may prescribe drops or ointment to help reduce inflammation. If it continues to be bothersome or interferes with vision, the pterygium can be surgically removed. It is possible for the pterygium to brow back after surgery.

A pinguecula is a benign yellowish bump on the white part of the eye. As with the pterygium, it is usually located on the inner corner of the eye and may result from excessive sun exposure or chronic eye irritation. It is not a tumor and it does not pose any threat to vision. Treatment is only necessary if the pinguecula becomes inflamed. If the pinguecula causes too much irritation, it can be surgically removed, but the remaining scar my still be visible.