None of the foregoing, obviously, had anything to do with an ingrown hair, but it would appear that whoever made up that fanciful version of events was at least dimly aware of the actual circumstances.
As to Mr. Fujiwara, the sushi fanatic who supposedly contracted brain worms by eating raw fish, that variation of the tale is simply preposterous.
Those two sentences sum up, pretty well my thoughts on the whole issue. I doubt the stories are real, even if snopes confirmed them as at least partially truthful. I think the rare brain cancer story is much more plausible. But, that's just me. Oh, and you lot have weak stomaches.