Condition	Characteristics
Perilimbal nevus	May mimic a pinguecula if situated on the temporal or nasal side of the limbus corneae; does not cause inflammation
Pingueculitis	Localized inflammation surrounding a pinguecula; does not grow onto the cornea
Pterygium	Triangular, fibrovascular lesion usually on the nasal or temporal side of the limbus corneae; may grow onto the superficial layers of the cornea
Subconjunctival foreign body	Small foreign bodies may lodge under the conjunctiva; history of acute, severe eye pain and redness is common; certain occupations or hobbies increase risk (e.g., activities involving hammering or chiseling)
Viral conjunctivitis	Generalized conjunctival congestion that is more pronounced in the fornices