I have small but prominent and touchable lump on my head. My mother noticed it around 1.5 mo ths back. It is painless. I almost forgot about it & realised few days back that its still there. When I checked with mom she said it has grown in size. We went to bone specialist who told us its osteoma and nothing to worry get xray done. But this did not got detected in xray. Then what is it? Is it something else? Should I investigate further or just leave it.