From your description it does not sound like chickenpox. That usually starts on the trunk area and affects the legs and arms later. It also will start with small spots and bumps that progress into blisters, and is generally quite itchy. Other viruses can cause different types of rashes, so this might be related to that infection. You might want to mention the rash to your GP and see if s/he wants to take a look at it to be sure it s not something treatable. Hope this helps.