It's over bundling, it's usually the kid who comes in and it looks kind of like little pimples. (pregnancymagazine.com)
Very itchy little pimples all over my face! (juicebeauty.com)
The other type is if you see the diaper rash and it has like small little pimples, to the outside of the redness, so you see like red dots that are actually a sign of a yeast infection. (pregnancymagazine.com)