Head bump

Does anyone know what this is??? I’ve had it since March this year when I was 6 months pregnant (what I know of) and it hasn’t gone away. I’ve noticed that where this bump is, my head feels strange, I don’t know how to describe it. It’s definitely not a pimple. I’ve tried popping it and still nothing happens. I haven’t got it looked at yet but I’m honestly afraid of what it might be and that I dont time/money to get it checked out.