ok guys. super weird, would appreciate help lol

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ok I have a lump on the back of my skull. always had it. my husband doesn't! so I googled it and it's an Inion? but a lot of people say only SOME MALES have them and girls never do?!?! does anyone have one? lol I've had it since I could remember, it's a hard bone like bump at bottom of my skull. make me feel better lol