Could be viral exanthem. My kids first sign that they're coming down with a viral illness is a faint rash either on their cheeks and around their mouths and/or on their torso. Every time it's turned out to be coxsackievirus. I hope he's not getting sick!
Re: Bumps on face? Getting worse!
Chicken pox? Is it on his torso at all?
Both of my kids got it, despite the shot. It was super mild, though.
DS - December 2006
DD - December 2008