Line indent

I had a breast scare a year ago which turned out to be thickened tissue in my right breast.

Today I noticed a long indented line on the outer edge of my left which runs round and under a bit of the breast. I’m trying not to panic because I was diagnosed with Mondor’s in 2018 as a result of a systemic autoimmune condition and it presented similarly. However I can’t feel a cord or anything this time and the indent is only really visible when I lift my arm.
I’m 45 and terrified. I’m calling the gp first thing x


How did you get on Cannary78 ?