Focal cemento–osseous dysplasia (FCOD) is a benign fibro–osseous lesion which changes cancellous bone tissue with each fibrous tissue and cementum–like material, or both together. Typically, the lesion is asymptomatic and is detected on routine radiographic examination. The teeth that are related to the lesion are vital. Radiological appearance of FCOD is radiolucent, radio–opaque or mixed radiolucent– radio–opaque together. In this case report a 37–year–old male patient presented with mixed radiopaque lesion surrounded by radiolucent area between the apical region of 2nd premolar and the 1st molar on the right side of mandible. The lesion was totally asymptomatic and found accidently on radiographic examination