My daughter had this. The pediatrician was our first stop, but he didn't do anything about it, didn't offer any treatment, or a diagnosis. Finally I took her to a dermatologist. Did the beetle juice thing every month or two for about 6 months, they just kept coming back. Derm was thinking the beetle juice (totally forget what the "real name" is), would stimulate the immune system, but evidently didn't work that way for her. Also suggested buying the ceravue (may have misspelled) lotion for dry skin, to pat dry instead of rub after bath/shower, etc. DD didn't mind the treatment as we just took the day off from school-it has to sit on the skin for a certain number of hours and then you wash it off, and went shopping and out for lunch. Wasn't so much fun when the bumps were on her armpits (blisters on the armpits-ugh) She doesn't have any scars, and no bumps for quite a while-I had actually forgotten about them when I read this thread.
We changed pediatricians soon after because she just had a few when I pointed them out to him, and by the time I took her to the derm she had a bunch. In hindsight I should have just skipped the ped and gone to the derm. Live and learn...