I worked at an Earring Tree years ago. We pierced ears with a gun, and everything WAS sterile. The earring were completely contained in a little sterile plastic "cartridge" so human hands never got to touch them. The cartridge was loaded into the gun and only the sterile plastic - and of course the earring inside it - touched the ear. We never had any problems with people coming back with infections, and one of the girls that worked there that summer had me give her another hole every other paycheck - several of them in cartilage.
My ears are not pierced, in case you are wondering. There are metal allergies in my family, and I never saw the point of punching a hole in one's body to hang metal objects from it. But that's just my opinion.
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