@ms91849
Don't you mean AK's -doesn't work on SK's. SK's are the topic of this post, they are only destroyed by freezing or a laser or a high concentration of hydrogen peroxide. Carac (fluorouracil) , Aldara etc are for pre canerous AK lesions. Much more serious than SK's which are not cancerous. I have to pay 200 at my dermatologist's office to have SK's zapped by liquid nitrogen . I had the 40 percent hydrogen peroxide treatment for SK's and it took 2 treatments and was more expensive and they don't use it any more. I'm on a regime of fluoruracil 5 percent now for AK's and when I get back to the dermatologists office in February I will have him freeze the SK's. He wanted me to go to the plastic surgeon to use a laser to ablate it since it's on my cheek and he didn't want his freezing it to leave a scar. That!s overkill at my age.