A Neuroma is formed when a nerve is either partially or completely cut. Think co-axial cable with the fascicles of the nerve being the individual fibers inside the bundle, there can be many of these in major nerves or just a few if a nerve is small. When a nerve is injured it tries to reconnect, if it cannot do this due to scar tissue or too much distance it will just create more and more axons trying to reach the target. A neuroma is big bundle of theses axons tangled up on themselves like a ball of yarn. They then just start to fire all by themselves in the chaos. Very painful. My nerve was only partially torn inside its sheath and it still went berserk sending out axons. I had burning, stinging, electric shocks and after a while deep shooting pains that went up my calf well above the cut nerve's territory. Mine was on a named nerve branch, but they can even form on the tiny cutaneous branches that get cut in surgical incisions.

I would be suspicious of pain that seems to stay all in one nerve track no matter if it goes all the up to your hip. Pain that goes all around the limb is involving more than one nerve path. You can find good charts for nerves of the leg online which may help you localize your pain if it can be localized.