Answer 1:
It sounds like you're saying your jewelry is doing what they call "migrating" -- and there's really nothing you can do about it. Eventually, it'll get so close to the edge that there will be a risk of the skin tearing, at which point you should remove the jewelry, if you have not already done so. If the skin doesn't tear, the jewelry will keep on migrating until it gets all the way out.
It's a bummer but a piercing is a foreign object in your body, and some bodies are just less tolerant of foreign objects than others! If your body wants it OUT OF YOU, it will get infected or, depending on the type of piercing, it can migrate. Belly buttons and eye-brow rings are especially to migration.
It's possible that this one migrated because it was not placed well by your piercer in the first place, or because you accidentally tugged on it and irritated it. If that's the case, you might have success if you re-pierce it. But if it's just the way your body is, then your body will probably do this again if you were to get it re-pierced.
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