Lately I have been getting this weird rash on my upper chest. It first appeared on thanksgiving. I thought it was just my sweater, but about 2 nights later it appeared again, in the same spot at about the same time. Then a few more days past and It would happen every day for about 3 days in the same spot at a different time then before. Now for the past 2 days or so it has been at a different time but in the same place. So now every day in 6th period it appears. I have no idea what it is, but im getting a little embarrassed by it. People ask me if I have hives. Its a new thing and I really want it to go away. Can anyone help me please? by the way my skin is extremely sensitive, but im not doing anything different. I really don't think its allergies because allergies are not timed like this is.