Hello and hope you are doing well.
It could be an allergic reaction. Sometimes you may not have an allergic reaction the first time you use a product, repeated usage can trigger a response. Allergic reactions can show a waxing and waning phenomenon. They can improve or worsen with time. Also it is possible to develop new allergies, you could develop new allergic reactions to food or other substances. You will only have to closely monitor.
Hope this helped and do keep us posted.
I am having the same reaction. I cannot find anywhere on the net exactly what the cup padding is made of. My newest Warner's bra has "20% Elastane indicated as bra content material, where my other two Warner bras have only 11%. I broke out after I purchased the 20%... What exactly is this material? Is it chemically similar to Latex?
I have a new Warner's bra #01526. I didn't break out the first time I wore it, but each time thereafter I've broken out in a red, itchy rash on my breasts. The doctor said it was an allergic reaction, possibly from my detergent, and gave me a cream to use. I switched detergents and still break out. I think it might be the padding under the material. It's 89% nylon 11% elastane but it doesn't say what the material for the padding is for. Does anyone have an answer? I am going to send a complaint to Warners U.S. and Canada, also and do more research on this.