You’re getting too much sun.
Some people develop a yellowish patch or bump on the whites to the side of their iris, called a pinguecula. “A small percentage of these are pre-cancerous, but usually they are not,” Herz says.
What causes them? “They are most often seen in people who spend a lot of time in the sun and are similar to a callus on the skin,” she adds. But a December 2013 study looked at ultraviolet light’s effects on the eye and found that wearing specific lenses may protect your peepers from sun damage, so talk to your ophthalmologist if you start seeing the patches.