Dacryocystitis is an infection of the tear sac that lies between the inner corner of the eyelids and the nose. It usually results from blockage of the duct that carries tears from the tear sac to the nose. The blocked duct harbors bacteria and becomes infected. Dacryocystitis may be acute or chronic. It may be related to a malformation of the tear duct, injury, eye infection, or trauma. 

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