My son is 5 months old and I noticed yesterday he broke out into a rash after his nap. It's under his chin, on the back of his neck, armpits and around his diaper line with a few spots on his trunk. I took him to express care and they said it was a virus, like a cold, and that it should go away. It blanches when I push on it, but instead on little dots it's more in clusters now. Should I be concerned. No fever.