Warts are a common problem and sometimes they are difficult to get rid of. One formula that I've used successfully contains Coptis, Scutellariae, and Phellodendron. You can buy them in the premeasured Sanjiu packets. Take one packet of each herb and mix together with a little vinegar to make a paste and then apply a thin coat to your wart. Re-apply daily until the wart goes away. You can refrigerate the paste between applications.

Here's the links to order these products:

http://eastearthtrade.com/index.asp?PageAction=VIEWPROD&ProdID=733

http://eastearthtrade.com/index.asp?PageAction=VIEWPROD&ProdID=574

http://eastearthtrade.com/index.asp?PageAction=VIEWPROD&ProdID=550

Order about 10 packets each to have on hand. They are not very expensive.