DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Eye cyst. Conjunctival cyst (red, centre left) on the eye of a 50-year-old woman, surrounded by red blood vessels. Conjunctival cysts may be caused by trauma such as an insect flying into the eye, or a chemical splash, such as a household cleaning agent. The conjunctiva is the delicate membrane that covers the cornea and lines the inside of the eyelid. A cyst is an abnormal sac, filled with liquid or semi-solid matter. If no pain or discomfort is felt then the cyst may be left and will subside with time. Alternatively it may be lanced. Surgical excision may be required if it becomes infected.
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