Pathognomonic of trachoma is –
Follicles are seen most commonly on upper tarsal conjunctiva and fornix. Sometimes, follicles are seen on bulbar conjunctiva where they are considered to be pathognomonic of trachoma.
"Follicles may be seen on bulbar conjunctiva (pathognomic of trachoma)".  — Khurana
Bulbar papillae
Palpebral papillae
Bulbar follicles
Palpebral follicles