My dh has just taken 8 yo dd to a and e on doctors advice, she has developed a v dense rash on her arm, like a bruise almost, dark reddy purple but it's not a bruise. did the glass test and it doesn't fade at all. Surgery said it's usual that the rash doesn't come til the child is shwoing more symptoms, dd seems fine, so telling myself it's nothing, but can't seem to find more explanations for a rash of this type. would appreciate any experience as trying not to go down the line of thinking it could be M. She has also deceloped a different type of rash on her neck that is spreading, like an allergic reaction rash, not at all like this one but could poss be linked?