Exposure to UV rays of the sun along with dry dusty climates can lead to conjunctival overgrowths. They include pterygium (left) and pinguecula (right).
Pterygium is a fleshy, pinkish mass which grows and encroaches on the cornea. In severe cases, it may affect vision. However, pinguecula is a yellow round growth which rarely interferes with vision.
Both can be excised surgically. Yet, they can be prevented in the first place by avoiding excess UV exposure and using sunglasses.
Image credits: https://www.webeyeclinic.com/pterygium/pterygium-vs-pinguecula