Bests & Worsts Reviews from Amazon

I ordered it because it said 100% cotton. I am allergic to polyester, it gives me skin rash. I got my purchased, washed it and wore it without diuble check because I trust Amazon's description. I got skin rash. Wonder why I got skin rash from 100% cotton priducts, I checked the label. I includes the picture here. It's 50% cotton 50% polyester. Why did they lied and costed me a discomfort and a doctor visit? Very disappointed!