What Does A Bump On Upper Forehead Indicate?

Hi, my name ie Mary,44 years of age,born with deformities on both legs and both hands,I,m a double amputee,had several surgeries ,on hands and legs,four c sections,about seven or so ago,I started to form a bump on my upper forehead,and I know it is my bone ,because it does,nt move with my skin,it is growing from my skull,but is small and slow growing,grows only a little spec a year..should I be concern,the doctor dis xray today and said he can see it ,but needs to get someone to read the xray,and said I might need a scan of my brain,I have to wait over two weeks ,because he,s leaving for vacation,can you give me any clues ??thank you..