A pinguecula is a yellowish patch or bump on the white of the eye, most often on the side closest to the nose. It is not a tumor but is an alteration of normal tissue resulting in a deposit of protein and fat. In rare cases, a pinguecula can grow onto the cornea, becoming a ptyergium. Pinguecula and/or pterygium can be a response to chronic eye irritation or sunlight exposure.
No treatment is necessary unless the pinguecula becomes inflamed, or grows onto the cornea, which can negatively affect your vision. In this case, it can be surgically removed to correct your vision.