Someone else allergic to polyester?

One year ago I bought some nice boxers, the kind that are a bit difficult to find in Italy. They are made of 50% cotton and 50% polyester.I've discovered that I am allergic to polyester. After wearing them for some hours, my foreskin starts itching, it gets red, I experience rashes, it seems like if it's sweating, and it's turgid and warm (but clearly soft, an hardon in that condition would be impossible to have) . If I remove that underwear as I clearly have to do, it gets back to normal in some hours.Clearly I could live without polyester and only with cotton, but I am curious if someone else suffers from the same or I am quite an exception.