I was working out on a piece of kit that simulates walking up some long steps for 30 mins, reaching 1000 steps and roasted 1430 calories.

I usually do just 400 a day in the morning but I was curious to see if I could hit 1000, after I did i felt like normal, needed abit of water, catch my breath, rest for 5-10 mins, but i went to change my clothes and i noticed these red marks almost rash like things on my chest... should i be concerned?

doesnt hurt or anything just kinda made me think what it was.