Podophyllotoxin

Podophyllotoxin is a pharmaceutical used to treat genital warts and molluscum contagiosum. It comes in ointment form and is applied directly to the affected area of skin. It's derived from the family of plants that include mandrake. It's fairly expensive - an amount necessary for a typical course of treatment costs about $200 USD.
Side effects tend to be mild - usually skin irritation. It's harmless to children and adults if used properly, but must be avoided during pregnancy as it can affect the developing fetus. Although the mandrake family is highly poisonous, the medication is safe even in large doses.
Podophyllotoxin at Wikipedia