Wiktionary
phlyctenule
n. A characteristic nodular affection occurring as an allergic response of the conjunctival and corneal epithelium to some endogenous allergens to which they have become sensitized.
Wikipedia
Phlyctenule
A phlyctenule (also called phlycten) is a characteristic nodular affection occurring as an allergic response of the conjunctival and corneal epithelium to some endogenous allergens to which they have become sensitized.