Wondering if anyone has ever seen anything like this before?? Any ideas what it is? My daughter 13, no known allergies, general well and never normally ill. Drs are involved but so far no joy, waiting on bloods etc, Rash has been there a couple of months now, not itchy or painful, feels slightly dry and is much darker IRL, like fake tan gone wrong. Accompanied by fatigue and dizziness, Dr has suggested possible autoimmune disease……anyone with a similar experience?