A rash on both breasts is not likely to be cancer, and from your description, it sounds like this rash might get better and then worse, which is also something that cancer does not typically do. Nevertheless, it might need medical attention, so check with your doctor if simple home remedies don't help. This article about rashes common in the breast area will give you some background information.
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thank you so much for clarifying. i was a bit worried because breast cancer does run in my family so with that said, i thought it might have been a sign. i think it might just be the detergent i'm using to wash my bras, being that it appears on both. i also have alleric reactions to some perfumes as well which go on my neck. im glad its nothing too serious. i really apprecaite your advice.