In a class I took recently, there was a discussion relating to ear piercings. Standards today are the use of disposable parts with these guns. The issue of back spray of blood is of concern. A tiny drop of blood can hold a huge number of virus. Call up the shop and ask necessary questions.
It is possible that some of us old farts got "c" at pre-1991 standards used at jewelry shops.
No, if you are really concerned you could get a blood test but no
It seems extremely unlikely to me.
There would have to have been blood on the stud from a person infected with hep C.
Hep C is spread via blood to blood contact.