how can you return with rid of bony protrusions on the skull?

Cut your nose bad, maybe?
Kill the Klingon! Then, sand his team leader down.
It's a major surgical operation, and you originate the process by asking your personal health vigilance provider to refer you to a general surgeon. You should also ask going on for the underlying cause. There are a couple of rather serious conditions that can cause bony ridges or clumps to appear on the skull.
Your robustness care provider will recount you if you have a condition that requires optional care. But see your vigour care provider soon. It could be a serious issue, especially if you are under 40 and/or these ridges are extensive or massive.
Have you tried a reciprocal saw?
Do you indicate the areas on your skull that fuse to protect your brain or the channels that protect your arteries?

Try Mexico.