actinic keratosis
"This is the fourth or fifth time I've used Flouracil the past thirty years or so.  I'm sixty four, have spent a lot of time in the sun, with a lot of exposure on my arms and face.  I started at age 35, the first time on my face, and went back three more times over the next twenty years, strictly on my face, ears, and back of hands.  The first time, I freaked out after a couple of weeks.  But after the four week treatment, it peeled off and my skin underneath came in baby butt smooth.  I'm doing my arms now (hint: always do this in the depths of winter) but my arms were really damaged, and it's been almost five weeks now.  I look like I survived Chernobyl and long sleeve shirts hide it.  I really recommend this for a widespread treatment."