Pinguecula and Pterygium

Source: all about vision
A pinguecula (pin-GWEK-yoo-lah) is a yellowish, slightly raised thickening of the conjunctiva on the white part of the eye (sclera), close to the edge of the cornea. Pingueculae typically occur on the part of the sclera that is between your eyelids and therefore exposed to the sun.
While pingueculae are more common in middle-aged or older people who spend a lot of time in the sun, they can also be found in younger people and even children — especially those who are often outdoors without protection such as sunglasses or hats.


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http://www.allaboutvision.com/conditions/pinguecula.htm