Imiquimod
"I am 64 and have a lot of what my Dr. describes as pre-cancerous areas.  I have just completed my 2nd two regime, the first having been done a couple of years earlier.  I did my head and the left side of my face about half way down my cheek-only wanted to look half horrible.  I took more than two weeks between the 1st and 2nd cycle both times to give the areas more time to heal.  Don't know the significance of this delay.  I got the eruptions to the point that I called my Dr who said there was no problem and showed photos I took during the treatment when I next visited my Dr.- all normal.  I did feel fluey, sore all over, and verging on sick to my stomach, a 200 mg IBU solved the problem-its a real miracle for me."