I actually went to the doctors about it and he said it wasn't actually a swollen lymph node, it was a cyst. Totally benign, apparently, and will likely never go away. He did a complete breast check but said everything was normal and sometimes cysts just happen. He was only able to tell what it was by feeling it though, so it's probably worth getting it checked out just to make sure it's the same. I know I felt tonnes better after I got a professional opinion.
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