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Allergic conjunctivitis is inflammation of the tissue lining the eyelids(conjuctiva) due to a reaction from allergy-causing substances such as pollen and dander.
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Conjunctivitis is an irritation or infection of the membrane that covers the white of the eye and the inside of the eyelid (conjunctiva). It can affect one or both eyes. The membrane swells and the blood vessels dilate (enlarge), making the eye red. That's why conjunctivitis is sometimes called red eye or pink eye.
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