I have a red blotchy rash on my arms and legs (but not my body at all). I’ve had it a couple of days, it’s not itchy, blistered or sore and I have no other symptoms. My friend, who is a retired nurse, thinks it’s urticaria or some sort of allergic rash. Is this a doctor thing or will it go away on its own? As it’s not bothering me apart from looking awful I’m inclined to leave it a couple of days. WWYD. Thanks for any advice.