Heel Pain

I have something growing out of my heal. It is hard and circular in shape it is white in color and it hurts like a son of a gun. I have learned to walk without putting my heal down, but even so I think it may be hitting a nerve or something because sometimes even when I am lying in bed it will feel like I am being shocked with electricity in my heal. Please help I’m not sure what this is…. can you give me an idea of what this may be?