Breast health?

I’m not really sure if this is the correct place to post this if not please let me know . Last night I noticed on my right breast at the top there was what looked like a mosquito bite but I know I haven’t gotten bitten by anything & a couple months ago (maybe 1 or 2) I had the same thing in the same exact place!! Is this a coincidence? Is it something I should be worried about ? This morning I looked & the bump is not there anymore but it’s still red & it doesn’t really itch . I also have pcos I’m not sure if that really matters ? & I’m 20 years old.