I have recently noticed a rash forming on my shoulder. It was itchy and I thought that it might just be acne or maybe just an allergic reaction to something. My father is allergic to many things and typically get allergic reaction quite often. I have waited about two weeks for the rash to go go naway not using anything that possibly agitate it. Doesn’t seem to go away. I typically put cortisone on it at night and in the morning. Nothing seems to be working in face it seems to be spreading to my lower back and chest. What could it be? And what can I do to treat and prevent this breakout from happening again?