So I started going to gym a little more than a week now because I wanna lose some weight. So I bought a pair of puma polyester shorts. I do about 40 mins on treadmill(5mph running, lots of sweat) and about 40 mins weights. First I noticed a few pimple-like thingys on my elbow and behind knees, didn't care much. But then it got worse, now I have a lot of red bumps on my right inner thigh, and about 10 mosquito bite like thingys on my buttocks. Itchy as hell. I was thinking if it could be the shorts that aren't breathable? Or I'm allergic to polyester? Heat rash? Eczema? Allergic to gym? Fml anyone could help me please?