Can knots on a forehead be smoothed out or "fixed"? (Photo)

So I have 2 knots on my forehead about a cm to the left and right of the center of my forehead. I look at younger pictures and I don't see them. And my mother says she doesn't recall them being there. I have hit my head once in the center very head and a large knot formed but I remember it completely going away. (They are hardly noticeable when looking straight on so I took aerial pictures as well)