I have 2 boney growths on my head. The larger one is on the front of my scalp at the hairline. A doctor I went to several years ago was sure it was a subasious cyst and tried to do surgery to remove it. He was shocked to find it was bone. I also have a smaller one on the right side of my forehead. The one he tried to remove is now losing hair.. I can no longer hide it with bangs.I am so self conscious about the lump on my head that I'm becoming depressed. I was told by another doctor who did x-rays that it is bone overgrowth and I would have to see a neuro surgeon because it is so close to the brain.. What causes this? Can it be safely removed and will it come back?