I have an odd rash on my lower stomach about where my bra sits, underneath it, and it's starting to spread to my stomach, near my shoulders and on my back. I have had this rash for about 6 months now. It itches, but is not raised. It's splotchy and circular. They appear to grow larger and connect over time. The color is a faded reddish pink. I am allergic to anything with sent or dye in them, but have not switched detergent, perfume or anything that comes in contact with that area. I was wondering what this might be and if I should be worried.