Hi. I go to dermatologist every 6 months. I was told to put fluorouracil on just precancerous areas, once a night. I usually have the areas zapped or frozen. Not sure what to do after reading reviews. Still, the precancer comes back but in different areas. I had an area from the nose and side of the head removed. I've been seeing a dermatologist since 2005. I didn't use sunblock growing up, and I was outside a lot playing sports. I always got out of the sun when I could, after about 15 minutes. Paying for it today. So does freezing precancerous areas work as well as the chemo cream?