Cantharidin is a chemical derived from the green blister
How It Works
Your doctor "paints" cantharidin on your
wart and covers it with a bandage. This is generally
painless. The cantharidin causes the skin under the wart to blister, lifting
the wart off the skin. When the blister dries, the wart comes off with the
blistered skin. You may feel some pain when the skin blisters. When you see
your doctor again, he or she will remove the dead skin and the
wart. If the wart isn't gone after one treatment, you may need another
Why It Is Used
Cantharidin is sometimes used if salicylic acid or freezing a wart
with liquid nitrogen (cryotherapy) has not successfully eliminated it.
How this information was developed to help you make better health decisions.