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If you can visually see a lump -- that is something that is outside of the skull, and not related to the underlying brain.
It could be a osteoma, or a calcified subgaleal hematoma (blood clot that hardened), and certainly her pediatrician could look at this area and help to determine what it is.
While a CT scan could also be helpful, you want to avoid radiation as much as possible especially in a young child.
It's unlikely that a blood clot from 6 years ago is causing pain now. But perhaps there was inflammation in the skull, and a osteoma formed there:
I'd make them aware just at the next visit, to see if this requires any further imaging.
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