Bug bite or cancer?

Ani

Hi!

I am 27 and breast cancer runs in my family. I noticed this big bite like bump on my left breast and I can't help but to think it could be more than a bite.

Noticed it 2 days ago. It has flattened out, no longer a bump however it's still very red and larger than I remember.

Please help.

I do not have insurance currently due to be laid off.