It may be Fifth's Disease. If so, just wait it out as it's viral. My son had it and ran a very low grade fever off and on. He had the rash on his face off and on, but he also had a "hive" looking rash on his torso and arms. Some of the rash was itchy at times. It really didn't slow him down much at all. Once the rash has appeared it's no longer contagious.