I think i recognize your skin problem i have something comparable like this only when i have the flue or something
This rash disappears when i am recovering,i only have it on my torso and the upper part of my arms.I my case it stays as long as i am sick and that usally only 2 or 3 days.
I have never been to the doctor with this because,it could be a allergic reaction to something
But unlike you it does not make my skin irritate.