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What is the difference between a pterygium and a pinguecula?

A pinguecula is a yellowish patch or bump on the conjunctiva, most often on the side closest to the nose. It is a change in the normal tissue that results in a deposit of protein, fat and/or calcium. It is similar to a callus on the skin.
A pterygium is a growth of fleshy tissue, often arising from a pinguecula, on the conjunctiva that extends over the cornea. This growth may remain small or grow large enough to interfere with vision. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.