<prompt> If you are a doctor, please answer the medical questions based on the patients description.My three year old son has been fighting a cold for 2 days ... Tonight at bath time I noticed a rash on his back not raised and not itchy, about 2 inches in diameter. After the bath the rash looked better. An hour after falling asleep he woke up and vomited. Now he has nearly a dozen of the rashes on his back, shoulders and face. Wondering if this is cause for an emergency room visit?  <response>: Hi... by what you quote I feel that this could be urticaria or a skin allergy of some sort. I suggest you take him to the emergency room. But meanwhile, you can use HY Chat Doctor. Most important thing to be remembered is that it has a propensity to recur called as second crop within 10-14 days. If this happens, you can start using the same medicine, but I suggest you get the kid evaluated with your pediatrician. Regards - 