Many possibilties: Could be result of previous trauma, could be a benign tumor such as an osteoma. Would have a physician evaluate to ensure that it is innocuous.
Answered 11/28/2017
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Head: You are likely describing what is called an osteoma, an extra growth of bone that can be firm and raised - lack of pain is key as those that are painful or those that are rapidly growing need to be examined further.
Answered 8/10/2018
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