Imiquimod
human papilloma virus
"This drug works well at killing warts, but it's best to start with the tiniest amount to check how your body responds to it, and then ramp it up if you don't get a strong response. 

I didn't follow the boilerplate "3 times a week" usage guidance because this was too slow for me. I used it every day and amply, until after about 1 week when the 'blistering' effect started to kick in, then I backed off. 

The negative reviews from people who got bad reactions are missing the point a little. The whole idea of the drug is to ramp up an immune response in the area you apply it. The red blistering/rash/swelling etc is precisely what you want: this is the immune system doing its work."