Cantharidin or what is often referred to as “beetle juice” or “bug juice” is a blistering agent that is derived from the blister beetle.  This compound is produced and used as a therapeutic option for both molluscum and warts. A day or two after the application, blisters occur on the areas that were contacted with the medication causing the molluscum to be “lifted” off the skin.  Typically the treated areas heal with no scarring, though residual redness or pinkness may remain and resolve more slowly. It’s usually repeated every 3 to 4 weeks until no new lesions are present.