I am 22 years old I eat healthy food and drink lots of watter. But it seems I have a problem...I have rash between my neck and the chest. It is red and itchy it is smooth doest look like pemples or bumpy. I dont know what it is or what caused it it seemed to creap on me when I was asleep...whould you help me by telleng me what I must do to make the itch go away.