How do I stop this from happening? Weird mark on my chest?

ArcticRussianFoxes
I got this mark on the top of my left breast. The white space is cleavage. I want answers about the mark not my cleavage. How do I get stop this. It emits this transparent liquid and stuff. Not sure how it got there or when. I am not sexually active and am a healthy 17 year old girl.

NO SEXUAL ANSWERS AT ALL.
NO TROLL ANSWERS EITHER. This is serious.

https://oi59.tinypic.com/2ugh0s2.jpg

I will not allow any anonymous answers. So if you are a troll who likes hiding, nice try.
How do I stop this from happening? Weird mark on my chest?
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