I can't see in the article any mention of the metal type used where there is skin contact. Metal for piercings can't be any old thing as people can develop alle

I can't see in the article any mention of the metal type used where there is skin contact. Metal for piercings can't be any old thing as people can develop allergies to the metal, usually from the nickel leaching out. Apparently that can get pretty nasty. The usual stainless steel formulation is something called 316L, I hope the guy used that, or something similarly suitable.