how much does it cost to get rid of a medium to small sized osteoma on the skull/side of the head? (photos)

I bumped my head in 8th grade. Now, it hurts so much and gives me headaches and it is sensitive when it is touched. Is this covered by insurance or is it considered a cosmetic procedure? If I have to pay; how much do you think it cost in California? Also, I have another head bump/osteoma on my forehead that grown bigger from small to big and is still hurting as much? What should I do?

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