Cantherone Plus is a combination of medications, including salicylic
acid, podophyllin, and Cantharidin. The primary ingredient is
Cantharidin, which is a blistering agent extracted from a blistering
beetle. I define it as a painless treatment because it does not hurt
(unless there are fissures in the skin) at the time of application in
physician's office. Later that day, there is pain as the blisters form,
make sure that the patient has adequate pain medication for when
that happens.