I agree with the.devil, you should try the warm compresses and sea salt soaks, and if you banged it around it may have caused it too.
And yeah how long have you had the piercing? If you just got it within the past couple weeks it could possibly have an infection or something.
And going back to the place you had it done may be out of the question because you can't get to it, but is there a place nearer to you that could take a look at it? If there isn't just try going to the doctor, even though they aren't piercers they're still good (hopefully) at helping you when you have a problem with a piercing!
Also, sometimes initially piercing industrials with bars can make healing difficult and make it easier to cause trauma to the piercings. Thats why some places don't put bars in initially. Just a thought.
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