I have very fair skin and always go see my dermatologist. This past visit he wants me to do this knarely cream on my chest cause he see's precancerous spots on my chest. I don't see them but I am not a Dr. This cream seems kinda scary. Not that cancer isn't but has anyone ever done this kind of treatment. I used a less evassive cream the last 2 years for like 6 months at a time but it I guess is not enough, this other stuff is more short term and I guess you really see what it does. Your skin gets all crusty and gross I guess. I am a little scared. I wish I didn't like to be outside so much! Biking and hiking are my fav things to do. But I do wear massive sunblock and cover myself now. But I was a california girl growing up so I am paying the price now. But again I don't know what he is seeing. I though my chest looked pretty good!