actinic keratosis
"I was prescribed fluouroucil for actinic keratosis, used it on my face, was told any redness, etc. would be temporary.  That was four years ago.  I'm permanently scarred w/ a few pock marks, particularly around the mouth. My face skin is now so much more sensitive than it used to be.  Below my chin also gets red super easy, like if I just rub my hand across that area once or twice.  (I later read a dermatologist say that he recommends excluding the chin area from treatment.)  The one actinic keratosis on my nose had been removed and this was a prophylactic use.  I'm very sorry I used this on my whole face. 

As far as being effective,  I can't really say, because I'd be speculating as to if I would have gotten more or not."