Dacryocystitis

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What Wikipedia says

Dacryocystitis is an infection of the lacrimal sac, secondary to obstruction of the nasolacrimal duct at the junction of the lacrimal sac. The term derives from Greek dákryon 'tear', cysta 'sac' and -itis 'inflammation'. It causes pain, redness, and swelling over the inner aspect of the lower eyelid and epiphora.

Excerpt from the Wikipedia article “Dacryocystitis”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: James Heilman, MD, CC BY-SA 4.0, via Wikimedia Commons.