My son has small blister like bumps on his stomach the range from the size of a pencil lead to about the size of marker tip. They are not itchy and started off with like one or two and now have spread over his stomach and on his right arm. I've taken to the doctor and they say its not warts. The are hard little bumbs that look like they have a white head or something in it; but you can't pop them. They don't itch him, but they hurt if you try to pop it or scratch it. They seem to be speading slowly. He know has one on his right arm. I'm at a lose. The doctors just tell to let go and watch it but its been two months and worried about his health. HELP!