There's a large red spot on my left ... please answer, I'm scared.?

I'm not sure but you should have it looked at. Its possible that you could have a case of ring worm. I suggest going to google and typing in ring worm and look at the images and see if any resemble whats going on. If so ...all you need is a tube of ointment that runs about 3-4 bucks. (oh and it doesn't have to itch to be ringworm either) good luck