What Causes Itchy Red Bumps All Over The Body?

Hi, my grandson had what we thought wS chicken pox. The the red bumps that appeared to look like chicken pox didn t spread like them no fever at all. The school nurse was sure it was and sent him home. Well after a few days the red bumps did not spread like chicken pox. He will get them on different parts of the body. They will itch for a couple hours and the the bumps will reduce but not go away. This has been going on now for two weeks. My daughter took him to a Dr. And the diagnosed him with a virus. Meaning they are not sure what it was. Id have pictures from the first bumps to now if there is a way to show them to you. Please let me know if you can help. He is still getting them. Thank You, Bridget Payne