👉 Pterygium is a condition in which the skin on the eyelid appears like a layer of growths called palpebrae pterygoidae, or "pterygoid patches." These palpebrae are usually small and round, but they can become larger and more pronounced over time. Pterygium can cause discomfort when it is visible on the eyelids, as well as an appearance that may be difficult to ignore. Pterygium can occur in both children and adults