Cobblestone appearance conjunctiva is typically seen with-
In Palpebral form of VERNAL KERATOCONJUNCTIVITIS (VKC) OR SPRING CATARRH Signs of vernal keratoconjunctivitis are Usually upper tarsal conjunctiva of both eyes is involved. The typical lesion is characterized by the presence of hard, flat topped, papillae arranged in a 'cobble stone' or 'pavement stone', fashion . In severe cases, papillae may hyperophy to produce cauliflower like excrescences of 'giant papillae'. Conjunctival changes are associated with white ropy discharge ref: A K KHURANA OPHTALMOLOGY,E4, Page-74
Phyctenular conjunctivitis
Foreign body
Spring catarrh
Trachoma
Conjunctiva