Itchy when exercising??

So I'm a usually active person but during cold weather my skin itches when I begin to run. It starts off at just my thighs and makes it to my stomach and arms etc and once i do a small scratch the itching intensifies by 10 fold. Has anyone else experienced this? I've been told it's genetic but I need to know if there's any remedies out there that helps make it bearable Pls 😪