If the plating wears off due to either body chemistry issues or improper care the brass underneath will be exposed, and reactions to brass are not uncommon. Most users will not experience issues of any kind.
1pc Lace Swirl w/CZ Gems 16g Septum Clicker Nose Ring 16 gauge Body Jewelry
The life of rhodium and/or gold ion plating depends on many factors, especially individual body chemistry and the amount of wear the jewelry receives. It is hypoallergenic and often used to plate jewelry because of its highly-reflective finish, hardness, and corrosion resistance.