My son developed a rash on Wednesday on his neck and top of his chest. I took him to the doctors on Thursday and she said it was just a rash because he had a virus. However it has now spread to his back and down his arms and is blotchy. I have checked and it fades under a glass but I have no idea what is going on. Am I wasting the doctors time and resources by going back I don't understand why it isn't clearing. Does anyone have any experience of this I feel like I'm overreacting.