A pingueculum is often confused with a pterigium. A pingueculum is an elevated bump on the white of the eye on the nasal side of the globe that does not grow onto the cornea. It can be red, irritated and inflamed. With time it may become yellow due to exposure to sunlight.
Some get white and chalky due to calcium deposition or vitamin deficiency. Surgery is not usually required, unless it becomes unsightly. Wearing sunglasses diminishes the yellowing. Prescribed eye drops may be required for continued redness and irritation.