Hi!
I just found the same thing on one of my girls in the exact same place. She seems healthy and is still eating well, and she is as active as she has been since I got her a few weeks ago.
We thought that maybe I was giving too much humidity causing a water bubble? I keep a humid hide in the cage, and I will also mist them about once a week.
Hope someone can give some direction! 
Thanks,
Susan
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