B.S.
If the bumps don't seem itchy, they could be Keratosis pilaris. This is a benign skin condition that usually shows up as little white bumps on the backs of the arms in adults. (If you or your hubby have these bumps on your arms/legs, that is probably what it is, as it is heriditary.) In babies, it can also show up on the cheeks of the face, the thighs and calves. My DD has this and the only thing that works to heal hers is a lotion called Aquaphor. The most bothersome part of it, is you expect to feel soft smoothe baby skin, not SANDPAPER on your baby's parts! The lotion REALLY gets my DD's skin back to baby soft.
BTW, hers start out a bit red, then turn white/flesh-tone in a few days. They are very rough at that point, but harder to see. The best thing to do is to put the moisturizer on within three minutes of bathing, but don't bathe everyday. This helps hold the moisture in and soften things up a bit.
Of course, you have the right idea by getting an actual diagnosis by your pediatrician, but you may be able to ask about using this lotion on your little one.
Best wishes! Let us know what the doc says.