Are 5 flourauricil benefits for scars long lasting?

I have been injecting triamcinolone +/- 5-FU for about three decades already for flattening keloid and hypertrophic scars. To answer your question, he results, once achieved, typically are permanent. I would like to add one cautionary note. Scar revision surgeries, particularly in areas subject to static tension or movement, (besides the expense and downtime engendered by the surgery), run the risk for the subsequent development of stretch scars and even tram track stitch marks. You might wish to consider simply flattening the scar a bit more via the aforementioned intralesional anti-inflammatory agents. Hope this helps.