My 6 year old son has small bumps on his chest and around his nipple. they look like pimples. they don't itch but he says they hurt to the touch. ?

There are many: possible causes, such as a contact rash, virus, allergy, eczema. Without seeing it, it would be difficult to make a diagnosis. You should take him to see his pediatrician, so that the proper diagnosis can be made and the proper treatment be prescribed. If you are a HealthTap Prime member, you can also obtain a consult from one of us (you can send a photo of the rash, or have a video consult).