Osteoma is a benign osteogenic tumor arising from the proliferation of cancellous or compact bone. In the facial bones, both central and peripheral osteomas have been described in the literature. Peripheral type of osteoma is the most common variant in the mandible, which occurs on the cortical bone surface. We present a case of a fourteen year old boy who had swelling on right and left parasymphyseal region. Radiographs revealed radiopacity having onion-peel appearance and histopathology gave the final diagnosis of osteoma. Periosteal reaction giving rise to onion peel appearance on the radiograph has been reported in Ewing sarcoma, Garre’s osteomyelitis and infantile cortical hyperostosis in the literature but our case shows that similar appearance can be there in osteoma as well.