Like Jenny C., we took our daughter to a dermatologist when we figured out exactly what she had (diagnosed by her primary care physician, because one was in her scalp, gotten scratched with a comb and then infected).
Beetlejuice combo (canthadarin sp?) and another thing mixed together and applied (one tiny toothpick sized touch of it) directly to the bump(s), then covered with a band-aid for 3 hours. Remove bandaids and wash gently but thoroughly with soap. The treatment irritates the molloscum bump, it erupts and the body's own immune system takes care of the rest.
If you child is covered in them (and that happens in some cases) this might not be the way to go. But my daughter only had a few. Two on her neck, one on her leg just below the knee. (At least, those were the only ones big enough to be noticeable... the one in her scalp had already healed and gone away by the time we got into the dermatologist). She was clear of them within a few weeks after treatment. But prior to that, she'd had them for probably a year with no change, except she developed additional ones (the first one I noticed was on her neck and initially thought it was a bug/ant bite).
It can take several weeks to get in to a dermatologist's office. But it can take 2 years for these to go away on their own. And they can spread to others if they get irritated/opened up accidentally (scratched).
http://nomoremolluscum.com/cantharone-cantharidin-mollusc...