Just wanted to report my experience so others can have a reference to compare.
I am a 58yo male who has had numerous AKs in the past that were treated with liquid nitrogen spray. I have also had a course of photodynamic therapy. Over the past 2 years, multiple rough areas reappeared on my forehead, nose, and ear lobe, and a few very distinct ugly red areas appeared on my cheek. All areas were considered AKs.
I made an appointment to see my dermatologist and was expecting to receive the nitrogen therapy. Instead, he mentioned that a new topical gel was available and recommended I try it--any areas that were not successfully treated he said he could zap with the spray on follow-up. I obtained Picato Gel and like others on this board was amazed at how small the tubes were. I applied the contents of tube number 1 to my entire forehead, bridge of my nose, spots on right cheek, spot on left ear, and a little on my lip. Needless to say, that was a major feat to do given the tube size. Application 1 was fairly well tolerated with minor exceptions: I did get a headache and noticed difficulty swallowing (I think I must have swallowed a bit that I put on my lip). Word of caution--if you apply the gel to your lip, I would recommend that you be very careful not to have your lip come in contact with the other lip until the gel has sufficiently dried. Alternatively, you may want to put a paper towel over your lips to prevent contact (just my advice). I did not experience much pain or burning but did have skin tightness. I did, however, pre-medicate with acetaminophen about an hour prior to application. I assume the more abraded skin you have, the worse the pain is likely to be (again, just my opinion).
After reading some of the posts in this forum, I had some apprehension about application number 2. I followed the same routine and had similar results with the exception of more burning and swollen eyelids. The pain was tolerable.
Same routine for application 3. Again, burning was noticeable, mild pain, swollen eyelids. I was glad all of the applications were done and experienced fewer side effects than expected. YMMV.
Face continued to be tight over the next several days. I started to peel around day 5. I was extremely careful not to facilitate the peeling. I also did not shave during the entire time period as I did not want to aggravate the cheek areas. The peeling continued until around day 9 at which time I was able to shave very comfortably.
Given the rough areas on my forehead and red burning skin on my cheek prior to Picato, I was very pleased with the results. I used all of the gel from each tube and applied gel around the same time each day. I took acetaminophen but did not need any other medication or ice. Again, your experience may differ. The results were very acceptable and, in contrast to nitrogen which leaves a white mark on treated areas, there were no after effects. I would estimate that ~85% or more of areas were successfully treated. I think almost all areas would have been eliminated if the tube was a bit larger as I might have missed some spots during application.
Given my history, I assume that even with use of sunscreen some rough and red areas may return. If so, I would gladly go for another course. I have a follow-up visit scheduled with my dermatologist to review results.