OK. I went to the doctor appointment today with my daughter. We just moved, so this is a new doc for us ... he seemed mystified, too -- he seemed to suggest that this was something that she would probably outgrow. However, in the last two days she has developed a cold and he discovered the very early signs of an ear infection when he checked her ears, so I wonder if this might have been a precursor to illness.
He also wondered if her bumps might be related to diet -- he suggested that I cut strawberries from her diet, but honestly, I don't think that's the problem because she had been eating strawberry yogurt no problem for weeks.
That said, Kate is now scratching at these bumps some -- not a lot, but we're going back in 10 days for a re-check on the ears and I'll let you know if her bumps are still there and if he says anything different.
Finally, I called our pediatrician's office last week and spoke with the nurse ... she said that it sounded like dry skin to her and suggested I slather on baby lotion. She said her son got the same bumps, too, as a baby/early toddler, and his took YEARS to disappear.
Curious stuff! I'll keep you posted, and please do the same in case you find out anything useful, too.
In the meantime: good luck!