Conjunctivitis , commonly called "Pink Eye" and "Red Eye" is an inflammation of the conjunctiva , most commonly due to an allergic reaction or an infection . = Blepharoconjunctivitis is the combination of conjunctivitis with blepharitis . Keratoconjunctivitis is the combination of conjunctivitis and keratitis . Episcleritis is an inflammatory condition that produces a similar appearance to conjunctivitis, but without discharge or tearing. Conjunctivitis has many different possible causes. It...