The only topicals used to treat MC are
Aldara and Retin-A. Anything else is likely to be a scam. Aldara is used more typically, and is available only with a prescription.
You can also have them cauterized or frozen, similar to warts.
Once one ruptures, be sure to clean up the contents carefully, as the centers of MC lesions contain the virus itself. However, once one breaks apart, normally it will heal just fine.