Molluscum – Why not to use cantharone, Case No. 1. Painful burns in a 2 year old child one day after treatment with Cantharone for molluscum spots which are clearly visible. Cantharone (cantharidin) is a highly toxic, poisonous substance extracted from beetles used for killing the wart virus. It is also very expensive. By comparison, molluscum frequently responds well to wheatgrass, which is non-toxic, safe and doesn’t damage the skin as seen here. After 9 days daily treatment with Wheatgrass extract, the burns have completely healed, mild skin discoloration persists and the child is pain free. The molluscum spots have almost disappeared which may be due to a combination of wheatgrass and Cantharone. Dr. Chris Reynolds. View more molluscum cases.