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To report a rare case of large conjunctival B-cell lymphoma in a child.A 13-year-old girl was initially diagnosed with a right lower eyelid chalazion. After 3 weeks during which the mass was growing, she was referred for treatment to our department. Because of the unusual appearance of the mass, an excisional biopsy was performed.Pathological findings were consistent with those of a large B-cell lymphoma. CD20 and Ki67 staining were positive, and polymerase chain reaction analysis showed monoclonality of B cells.Although conjunctival lymphoma is a very rare entity in children, it should be included in the differential diagnosis of an eyelid or conjunctival mass.