Brown pigmentation round spot under breast

Lily

When I was pregnant I started getting skin tags and this round spot and all kind of craziness under my breast and the line area, couple of skin tags fell, but I still have this brown mark that kinda looks ringwormy and round shape, I finally made an appt with dermatologist but anyone else have same issue?? I still breastfeed, I googled like crazy can't figure I out.