Definition
Infection of lacrimal canal

Signs
Unilateral tenderness, redness, swelling at medial canthus
Epiphora

Causes
Bacterial Infection - usually Actinomyces israelii (anaerobic Gram +)
   sometimes secondary to obstruction of lacrimal canal by some object

Differentials
Dacryocystitis - has more pain and more swelling than canaliculitis

Treatment
(Express canal with cotton tip applicator to see if anything released from puncta)
Initial treatment  -  Topical Antibiotics
Secondary - if initial treatment unsuccessful, perform canaliculotomy