My son has a rash all over his body. we went to the doctor and he suspects viral rash. how long does it take to go a way. should i be worrii'd?

Viral exanthem: May take 2 to 4 days to resolve. As long as your child is acting himself, eating and drinking should be fine to let run its course. Coxsackie virus is a common viral infection to cause this rash.

Depends on condition: The length of the rash varies and depends on the condition but 3-5 days is usually typical. No need to be worried if it is a viral rash, nothing you will do will make it go away faster, it is the body's response to the virus.