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In page Conjunctivitis:
"Allergic conjunctivitis is inflammation of the conjunctiva due to allergy.[1] The specific allergens may differ among patients. Symptoms result from the release of histamine and other active substances by mast cells, and consist of redness (mainly due to vasodilation of the peripheral small blood vessels), swelling of the conjunctiva, itching, and increased production of tears.[citation needed]
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