i don't know if it's rare, but i have some annoying metal sensitivity but i'm told it's because i have fillings. those wrappers gum come in, the foil ones. touching them with my fingertips is slightly uncomphertable. it's like a very very light biting aluminum foil with fillings.
once i got a brassy metalic taste from touching my dornob and after prolonged change touching it is icky. the smell of it i can taste that.
unless it is not uncommon.
some metals hurt to slightly touch.
or was it because for a chunk of my life (at 6 yrs old) i had a rod in my spine, herington rod for the scoliosis