What Does A Mole On The Breast Indicate?

I am scared silly over the thought of melanoma but I have seen all the signs and symptoms from google but I need a professional opinion. I have had a mole on my left breast for from what I know, a year or so. It has not changed in size or color from what I’ve noticed. From a distance it looks symmetrical but up close it is slightly jagged and has two different shades of brown, one dark in middle and light on the outside. I have been to two primary care doctors so far. One said it’s absolutely nothing and the other measured it and said to come back in six months and have it measured again. I scheduled an appt with the Derek to double check because my anxieties will not leave me alone. Please help with any advice. Does this sound worrisome?