I'd watch out because it sounds like how I started with pityriasis rosea! Google image it and see if it looks anything like it. If it is that, it won't go away until the skin condition has fully developed. It will also be the first patch to appear and the last to go! It's called the herald patch, also known as the mother patch. If you start developing smaller patches all over your chest, back, arms and maybe legs it's probably this. Don't worry it's not contagious and not an allergic reaction, it's something to do with being stressed. You cannot cure it, you can only wait for it to leave on it's own accord. I found that eating healthy, relaxing and applying LOTS of moisturiser and itch relief cream helped :) hope this helps xo
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