My 5 year old son has a rash on his cheeks and arms he said his arms itch but thats all. he feels fine, no fever just spots warm what is this? and how should i treat it?

Parvovirus B19: You are accurately describing erythema infectiosum caused by infection with parvovirus b19. He will probably develop a lacy rash on arms or trunk within a few days. It is also called slapped face fever. The overwhelming majority of these infections are benign and self-limited and require no treatment.

Fifth disease.: If this is parvo b19 ( erythema infectiosum - fifth disease) the adults in the family may be expected to develop a flu like illness followed by a pretty characteristic arthritis ( hands, wrists, knees and feet.) which eventually fades. This may be a serious illness if you are pregnant.