I first noticed that I have been getting a rash in the center of my chest about two months ago. It isn't always there, and there isn't really any side effects other than it getting hot. It's not raised, it's not itchy, it's not really anything, just a rash. However, recently the rashes have been getting bigger and I noticed my heart pumps a little faster when the rash is present. Since there hasn't been any threat until recent, I was wondering what is going on?