A two-year-old racing pigeon was presented with a bulging of the lower conjunctival mucosa of the left eye. As this lesion did not respond to repeated treatments with antibiotics (both topically and generally), surgical removal of the tumoral tissue was performed. Histological examination of the sample revealed a well defined pyogranuloma surrounded by giant cells and a palisade epithelium. This case report illustrates the importance of biopsy and histological examination for the diagnosis of a non-reactive conjunctival swelling.