Red blotches on skin?

Songbirdie90

I was just wondering if this is an exercise/sweat problem or something different. I have just started doing proper diet and exercise in the last week. Since ive started i have gotten these strange raised red blotches on my skin, theres a couple on my back, about 12 on my stomach and 1 quite big one on the side of my knee. They are not itchy but are a concern as they've only appeared in the last week. I am not allergic to anything either, so i'm just wondering if others have had this due to sweating from exercising?

I will note i have done a lot of exercise before e.g. zumba, walking, swimming and never had this and will be going to the doctors on monday to get it checked out.

Thank you in advance

bumblebums

Maybe your skin is reacting to your sweat? Try wearing something that breathes better.