Just wondering...what make you all think it ISN'T a stretchmark?
I think what you're worrying about, and what is coming up on google, is Inflammatory Breast Cancer. This is my #1 health anxiety fear right now. I actually went to my gynecologist recently because I was so worried had it. He said that in his entire career, he's seen it twice. Both presented with SEVERE inflammation.
But, I have also seen those stories about the women who just have a dent, or a rash, or something that looks like a bug bite. They torture me!! I'm working every day to just have faith in my doctors and believe what they say.
That being said, I know that IBC is VERY VERY VERY rare. I also know that it moves VERY fast. How long have you had this spot? The longer you have it with no other symptoms, the more sure you can be that you are fine. But you should be sure anyway---trust your doctor.
You're not alone with these scary ideas...I'm just glad to hear that everything turned out well for you. Let yourself feel some peace.