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I think the term you want to ask its pinguecula or pingucular degeneration, which is a type of conjunctival degeneration, usually on the nasal side of the white of the eye, the sclerae.
The sclerae is covered by a transparent film, called the conjunctiva, which, over time, can become swollen (chronic inflammation) and with time, leads to a ptegyon formation, which is nothing more than an advanced pinguela (a pterygeon is said to have formed when the swollen conjunctiva from a pinguecula starts to grow on top of the cornea; the cornea its the glassy part of the eye on top of the iris, the color of your eyes).
Its causes are not 100% understood, nor does the expert agree exaclty how, but it is generally accepted that it is due to sun exposure, dry eye (bad tear film) or constant irritation of that conjunctival area.
The treatment of the pterygion (one should NEVER operate a pinguecula) its surgical removal, which is a rather easy and minor procedure.
