I'm just a tad worried and wondering if anyone has any info to pass on. So, about 4 or 5 months ago I started to develop a flat, birthmark under my breast. It seemed to come suddenly and grow quickly. When I first otied it, it was about 1 cm, now, after a few short months it is maybe 3.5 cm. Then, last week, I noticed at least 4 more of the same flat, discolored skin spots, which look just like flat birthmarks, on the same breast. They are all quite small now, but growing. Any idea if this sounds dangerous at all?? Thanks.